[R] Dispersion Index in POT
Dear All, I would like to plot the dispersion index against lambda and dispersion index against threshold. Appreciate if someone could help me to extract dispersion index in POT package. Pls also let me know the way to calculate it manually for a skewed distribution. Thank you [[alternative HTML version deleted]] __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Continuous Wavelet tranform in Biwavelet Package
Dear All, I have 15 minutes of temperature data for 3 years and would like calculate and plot the CWT using wt command in Biwavelet package. Appreciate if someone could tell me the way to define it in wt command. Thank you, [[alternative HTML version deleted]] __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] R2 for a mixed-effects model with AR(1) error structure
Dear All, The following equation is a linear mixed-effects model with linear trend and AR(1) error structure, y = B0 + B1x + bo + b1x + e; e~AR(1) where y is a response, x is the predictor, B0 and B1 are fixed effects and b0 and b1 are random effects. Coud someone please advice me a function to compute the R2 for the goodness of fit of the above model in R package, and are the computation for R2 in the mixed model with AR(1) error structure similar to the mixed model with no error structure? thanks, Fir [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] goodness of fit of a mixed model and function in R
Dear All, Could anybody please advice me the way to check the goodness of fit of the linear mixed-effects model and the suitable function in R to do so, and thank you in advance for your assistance. Fir [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Extremum index from a sampling time series data
Dear All, I am working on a time series of hourly river flow measurements from 2000 - 2003 and have been trying to compute the extremum index from the original series as well as a new series from sampling with replacement . The extremum Index produced from the original data series looks fine but sadly, a strange value of index is given from the sampling. The flow measurements are in range of 0.1 to 35m3/s and are stored in data frame with the codes and results are as follows: ## ### Codes ### attach(data) # Estimates of extremum index library(evd) library(boot) set.seed(101) threshold - 15 ej - exi(data$flow, u=threshold) # Extremum Index computed from the original series of river flow ei - exi(sample(data$flow, replace=T), u=threshold) # Extremum Index computed from sampling of the original flow series with replacement ei; ej mean(ei); mean(ej) ### Results ei = 0.4 ej = 1 mean(ei) = 1.023 mean(ej) = 1.014 ### I would expect that the results for both index should be slightly similar as the features of both original sampling series are more or less the same as highlighted by their sample mean and so, could anybody please advice me on this matter? Thank you, Fir [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] cluster analysis on extreme event
Dear all, I'm modelling extreme rainfall,particularly those that lie above a threshold was searching for a suitable package in R which may enable a cluster analysis on those extreme events and would really appreciate for any suggestions. Thanks, Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] best subset regression in R
Dear All, Could someone please give some advice the way to do linear modelling via best subset regression in R? I'd really appreciate for your kindness. Thanks, Kagba [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Box-Cox transformation in R
Hi, Could any one please help how I can transform data based on Box-Cox Transformations in R. Any helps will be much appreciated. thanks, Kagba [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] How to find points of intersection
Dear All, I'm looking an appropriate way in R to compute/estimate points of intersection between a line and a curve and will really appreciate for any suggestion or ideas? Thank you, Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] How to find points of intersection between harmonic function and a line
Hi, Sorry for the very short explanation about the problem of intersection. I have a wave function monitored from the heart beat in a particular interval of times. Apart fom that, there is a line with positive slope (e.g: y = x+2) which lies across the wave and intersect on a number of points. My problem is i have no exact equation for such a complex harmonic wave produced by the heart pulse and so, cannot manage to find the intersection points. Therefore, i would be very grateful if someone could give some ideas or might suggest any packages in R that can assist me to do so. Thank you, Fir - Original Message From: Uwe Ligges lig...@statistik.tu-dortmund.de To: FMH kagba2...@yahoo.com Cc: r-help@r-project.org Sent: Tue, February 22, 2011 1:11:41 PM Subject: Re: [R] How to find points of intersection On 22.02.2011 12:27, FMH wrote: Dear All, I'm looking an appropriate way in R to compute/estimate points of intersection between a line and a curve and will really appreciate for any suggestion or ideas? Sounds like second level school homework. If not, please explain your problem in more detail and PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Uwe Ligges Thank you, Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] How to find points of intersection between harmonic function and a line
Hi, Sorry for the very short explanation about the problem of intersection. I have a wave pattern monitored from the heart beat in a particular interval of times. Apart fom that, there is a line with positive slope (e.g: y = x+2) which lies across the wave and intersect on a number of points. My problem is i have no exact equation for such a complex harmonic wave produced by the heart pulse and so, cannot manage to find the intersection points. Therefore, i would be very grateful if someone could give some ideas or might suggest any packages in R that can assist me to do so. Thank you, Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] How to find points of intersection between harmonic function and a line
Hi, Sorry for the very short explanation about the problem of intersection. I have a wave function monitored from the heart beat in a particular interval of times. Apart fom that, there is a line with positive slope (e.g: y = x+2) which lies across the wave and intersect on a number of points. My problem is i have no exact equation for such a complex harmonic wave produced by the heart pulse and so, cannot manage to find the intersection points. Therefore, i would be very grateful if someone could give some ideas or might suggest any packages in R that can assist me to do so. Thank you, Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Optimal choice of the threshold u in Peak Over Threshold (POT) Approach
Dear All, Could someone please suggest me the way to calculate the optimal threshold in POT method via any available packages in R? Thanks, Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] NA with lmList
Dear All, I was trying to use the lmList function to get the lmList graphic but have a problem creating the graphic. My data has missing values and an error occurred as stated below. ### library(nlme) a schoolid spring score childid 1 1 0 550 345 2 1 1 568 345 3 1 0 560 456 4 1 1 NA 456 5 2 0 540 32 6 2 1 562 32 7 2 0 579 34 8 2 1 599 34 (lmlis1 - lmList(score ~ childid | spring, data=a, na.action=T)) Error in UseMethod(getGroups) : no applicable method for getGroups ### Could anybody advice me the way to write the command correctly, which ignore the missing data? Cheers Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] How to change font size in plot() function
Dear All, Could someone please advice me the way to change the size of the title and x and y-label in plot() function. I've tried to use 'font' and 'font.main' call in plot() function, but it didn't make any changes in terms of the size. Thanks Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Kalman filter
Dear All, Could anyone give me a hand to suggest few packages in R to running Kalman prediction and filtration ? Thanks Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] SARIMA model
Dear All, Could someone please advice me the appropriate package for fitting the SARIMA model? Thanks Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] smoothing parameter in locfit package
Hi, In the locfit package, could someone please let me know the automatic selection of smoothing parameter if Gauss kernel density function is used as weight function? thanks Fir [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] smoothing parameter in locfit package
Thank you Andy. I'm aware of that but my question is about the way the locfit package use to automatically determine the bandwidth/smoothing parameter if Gauss kernel density function is used as the weight function. Does the generalized cross validation criteria is imposed here or does the value of the bandwidth is fixed (by default) in the package, unless we specify our own value? Cheers, Fir - Original Message From: Liaw, Andy andy_l...@merck.com To: FMH kagba2...@yahoo.com; r-help@r-project.org Sent: Mon, May 10, 2010 4:00:51 PM Subject: RE: [R] smoothing parameter in locfit package See the kern argument in ?locfit.raw. Andy From: FMH Hi, In the locfit package, could someone please let me know the automatic selection of smoothing parameter if Gauss kernel density function is used as weight function? thanks Fir [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Notice: This e-mail message, together with any attachments, contains information of Merck Co., Inc. (One Merck Drive, Whitehouse Station, New Jersey, USA 08889), and/or its affiliates Direct contact information for affiliates is available at http://www.merck.com/contact/contacts.html) that may be confidential, proprietary copyrighted and/or legally privileged. It is intended solely for the use of the individual or entity named on this message. If you are not the intended recipient, and have received this message in error, please notify us immediately by reply e-mail and then delete it from your system. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Third and fourth order of derivative in smooth.lf function from locfit package
Dear All, Could someone please advice me the way to define the derivative of the local polynomial regression in third and fourth order from the smooth.lf function? Thank you Fir [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Derivative of a smooth function
Dear All, I've been searching for appropriate codes to compute the rate of change and the curvature of nonparametric regression model whish was denoted by a smooth function but unfortunately don't manage to do it. I presume that such characteristics from a smooth curve can be determined by the first and second derivative operators. The following are the example of fitting a nonparametric regression model via smoothing spline function from the Help file in R. ### attach(cars) plot(speed, dist, main = data(cars) smoothing splines) cars.spl - smooth.spline(speed, dist) lines(cars.spl, col = blue) lines(smooth.spline(speed, dist, df=10), lty=2, col = red) legend(5,120,c(paste(default [C.V.] = df =,round(cars.spl$df,1)),s( * , df = 10)), col = c(blue,red), lty = 1:2, bg='bisque') detach() ### Could someone please advice me the appropriate way to determine such derivatives on the curves which were fitted by the function above and would like to thank you in advance. Cheers Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Inflection point on a curve
Dear All, I have been trying to find an inflection point from a nonparametric model, for instance on a series of Economics, Financial, Environmental data, which was fitted via sm.regression package, but have difficulty to find the derivative of the model. The following are the data and the codes to fit such a nonparametric model. ### library(sm) x - c(6.3, 6.6, 7.0, 8.0, 8.8, 9.8, 12.0, 14.2, 15.5, 15.7, 15.8) y - rev(seq(1,51,by=5)) sm.regression(x,y,method = cv, col = red) ### Could someone please advice me an appropriate way to determine such an inflection point from the nonparametric model? Thank you Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Changepoints estimation in a data series
Dear All, I'm trying to find changepoints in a data series which only consist of 11 measurements of altitude(x) and temperature(y), respectively, in which the data are as followed: y = 16.3, 16.2, 16.1, 15.6, 14.2, 10, 8.2, 8.0, 7.5, 7.3, 7.2 x = 1, 2, 5, 10, 15, 20, 25, 30, 40, 50, 60 From the above series, i reckon there is more than one changepoint and presuming there is a package in R which might enable the estimation on such changepoints. Could someone please advice me on this matter by using R? Cheers, FMH __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] How to extract one of four plots in a linear regression model
Dear All, A linear regression model could be fitted by using lm function and the plot function can be used to check the assumption of the model. The help menu shows few instances on suitable coding for fitting such a linear model. In addition, four different plots could be extracted simultaneously with only a single plot function as followed: require(graphics) ## Annette Dobson (1990) An Introduction to Generalized Linear Models. ## Page 9: Plant Weight Data. ctl - c(4.17,5.58,5.18,6.11,4.50,4.61,5.17,4.53,5.33,5.14) trt - c(4.81,4.17,4.41,3.59,5.87,3.83,6.03,4.89,4.32,4.69) group - gl(2,10,20, labels=c(Ctl,Trt)) weight - c(ctl, trt) anova(lm.D9 - lm(weight ~ group)) opar - par(mfrow = c(2,2), oma = c(0, 0, 1.1, 0)) plot(lm.D9, las = 1) The plot function gives four different plots simulaneously but i just need only part of them, for instance the normality plot. Could someone give some ideas the way to extract this single plot as i need to copy only this plot and paste it into Word document. Thanks Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] How to add a title to represent four different plot in lm function
Dear All, A linear regression model could be fitted by using lm function and the plot function can be used to check the assumptions of the model. The example is as followed. require(graphics) ## Annette Dobson (1990) An Introduction to Generalized Linear Models. ## Page 9: Plant Weight Data. ctl - c(4.17,5.58,5.18,6.11,4.50,4.61,5.17,4.53,5.33,5.14) trt - c(4.81,4.17,4.41,3.59,5.87,3.83,6.03,4.89,4.32,4.69) group - gl(2,10,20, labels=c(Ctl,Trt)) weight - c(ctl, trt) anova(lm.D9 - lm(weight ~ group)) opar - par(mfrow = c(2,2), oma = c(0, 0, 1.1, 0)) plot(lm.D9, las = 1) Could someone advice me the way to add a single title either at the above or bottom of these 4 plots, entitled The verification of model assumtion via four different plots ? Thanks Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Color intervals in image function (image.plot)
Hi, The script below is my current coding in order to produce a contour plot of temperature across altitude and time. In my case, time,altitude and temperature are represented by x, y and z variables. ## Brazilan.Pallete - colorRampPalette(c(blue,green,yellow,red)) image.plot(x, y, z, col = Brazilan.Pallete(50)) contour(x,y,z, levels = seq(1, 20, by = 1), add = TRUE, col = 'peru') ## The plot worked fine but i found difficult to fix the interval of the color corresponding to z value. In my case, the range of z values is between 1 and 40 and i'd like to fix the color in the image correspoding to four sub-intervals of z values. For instance: 1. 1 z 10 : blue 2. 11 z 20: green 3. 21 z 30: yellow 4. 31 z 40 : red. I did't find a suitable coding to do this. Could someone please give an advice on this matter? Thank you. Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Color intervals in image.plot function
Hi, The script below is my current coding in order to produce a contour plot of temperature across altitude and time. In my case, time,altitude and temperature are represented by x, y and z variables. ## Brazilan.Pallete - colorRampPalette(c(blue,green,yellow,red)) image.plot(x, y, z, col = Brazilan.Pallete(50)) contour(x,y,z, levels = seq(1, 40, by = 1), add = TRUE, col = 'peru') ## The plot worked fine but i found difficult to fix the interval of the color corresponding to z value. In my case, the range of z values is between 1 and 40 and i'd like to fix the color in the image correspoding to four sub-intervals of z values. For instance: 1. 1 z 10 : blue 2. 11 z 20: green 3. 21 z 30: yellow 4. 31 z 40 : red. I did't find a suitable code to do this. Could someone please give an advice on this matter? Thank you. Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] How to seperate date and time into different columns?
Dear All, I have a series of data in which the first column consist of a combination of date and time, for instance 17 April 2008 at 4.01pm, such data is recorded as: 4/17/2008 16:01 I'd like to seperate it into four different columns which consist of Day, Month,Year and Time, respectively. Could someone please advice me on this mater? Thank you, Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Interception point between two lines
Dear All, Let mod2 and mod3 are two regression equations representing two distinct lines and i'm keen to find the intreception point between these two lines and the following are part of the codes. m1 - as.matrix(rbind(coef(mod2), coef(mod3))) a - cbind(c(1,1), -m1[, 2]) b - m1[,1] c - solve(a=a,b=b) Unfortunately, there is an error message given as stated below and i don't understand what it meants for. ' Error in drop(.Call(La_dgesv, a, as.matrix(b), tol, PACKAGE = base)) : system is computationally singular: reciprocal condition number = 1.14557e-16' Could anybody advice me on this matter? Thank you Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Inverse matrix
Dear All, Let A is a matrix which is: A - matrix(c(1,2,3,4),nrow=2) How could we find the inverse of A? I try to use ginv(A), but it didn't worked. Thanks Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] A comparison between span in lowess method and h in sm.regression
Dear All, I have fitted a bivariate and an additive model on a monthly temperature from 1987-2007 via nonparametric regression and would like to compare between these models via F-test, but having difficulty in determining the possible values of span with lowess method. For instance, these two models are defined in R as: ## bivariate.model - sm.regression(c(month,year), Temperature, h = c(0.2,0.8)) additive.model - gam(Temperature~lo(month, span=A) + lo(year,span=B)) ## However, i notice the sm.regression function uses h as a smoothing parameter whilst the gam function uses span as a smoothing parameter, and these models can't just simply be compared straight forward, but few adjustments should be made on the values of span in gam function, corresponding to the values of h in sm.regression function. Could anyone please advice me the possible values of A and B in the gam function above? I'd would be very grateful for any idea and suggestion towards this issue. Thank you Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] [R-SIG-Finance] Additive decomposition method
Hi, Thank you for the function. I was trying to use the decompose function, but the program cannot run as there were several missing values in my data frame. Could someone advice me the way to handle on this matter? Thanks F __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] tapply function
Hi, I tried to use tapply function to find the mean of the data in each group as the following command, but the result are NA, as there are several missing values in each group. tapply(data,group,mean) Could someone please advice me the way to ignore the missing data in order for the fucntion to run successfully? Thanks Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Additive decomposition method
Dear All, I'm doing an imputation on few missing data and is looking for an additive decomposition method in R. Could someone please advice me the way to do this? Thank you Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Decomposition method
Dear All, I'm doing an imputation on the missing data and is looking for a decomposition method in R. Could somone advice me the way to do this? Thank you Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] How to find the interception point of two linear fitted model in R?
Dear All, Let have 10 pair of observations, as shown below. ## x - 1:10 y - c(1,3,2,4,5,10,13,15,19,22) plot(x,y) ## Two fitted models, with ranges of [1,5] and [5,10], can be easily fitted separately by lm function as shown below: ### mod1 - lm(y[1:5] ~ x[1:5]) mod2 - lm(y[5:10] ~ x[5:10]) ### I'm looking for the interception points between these two straight lines from these fitted models, mod1 and mod2. Could someone advice me the way to do it? Thank you Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Estimation in a changepoint regression with R
Dear All, I'm trying to do the estimation in a changepoint regression problem via R, but never found any suitable function which might help me to do this. Could someone give me a hand on this matter? Thank you. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Slope between two points
Dear All, Let 499 piece-wise lines were buit up by 500 pair of observations, via R code below. x - 1:500 y - rnorm(500) plot(x, y, type = 'b') I was trying to compute all the slopes for the lines which were connected between two adjacent points. For instance, slopes of lines between first and second points, second and third points, and so on, until between points 499 and 500, respectively, but sadly, i never found a suitable function do this computatation efficiently. Could someone please advice me on doing this? Thank you Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] How to use multiple time series in R?
Dear All, I have temperature series for 10 different sea levels, where there are 3000 observations for each level. I am planning to use multiple time series modelling on these series, with/ without correlation structure for the residuals. Is there any package that can be used to do this operation, and i really appreciate for any suggestion/advice on this matter. Thank you __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] How to speed up R with version 2.9.2?
Dear All, I'm sorry if my question does not suit with this R group. I have recently installed R software with version 2.9.2, but i found the program took almost 1 minute as soon as it was opened, before it can be used. However, the previous version 2.9.1 only take few seconds after the menu bar was clicked. This circumstance has caused me to wait for couple of minutes as several R windows were opened simultaneously. Are there any ways to speed up on this 2.9.2 version? Could someone give some hints, please? Thank you Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] How to speed up R with version 2.9.2?
Thank you for your answer. I'm using Win XP with 2GB RAM in memory. Cheers Fir - Original Message From: stephen sefick ssef...@gmail.com To: FMH kagba2...@yahoo.com Cc: r-help@r-project.org Sent: Fri, October 2, 2009 4:38:10 PM Subject: Re: [R] How to speed up R with version 2.9.2? You're fine, but please do read the posting guide. What OS etc. Where you doing anything else on the computer? Is this a RAM limitation? I have 2.9.2 running on two flavours of linux, mac os x and windows all 2.9.2 and there doesn't seem to be a problem. regards, Stephen On Fri, Oct 2, 2009 at 10:35 AM, FMH kagba2...@yahoo.com wrote: Dear All, I'm sorry if my question does not suit with this R group. I have recently installed R software with version 2.9.2, but i found the program took almost 1 minute as soon as it was opened, before it can be used. However, the previous version 2.9.1 only take few seconds after the menu bar was clicked. This circumstance has caused me to wait for couple of minutes as several R windows were opened simultaneously. Are there any ways to speed up on this 2.9.2 version? Could someone give some hints, please? Thank you Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Stephen Sefick Let's not spend our time and resources thinking about things that are so little or so large that all they really do for us is puff us up and make us feel like gods. We are mammals, and have not exhausted the annoying little problems of being mammals. -K. Mullis __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] How to speed up R with version 2.9.2?
Yes, i noticed there are few Windows start up programs, shown by the EasyCleaner software. Cheers - Original Message From: Gabor Grothendieck ggrothendi...@gmail.com To: FMH kagba2...@yahoo.com Cc: stephen sefick ssef...@gmail.com; Sent: Fri, October 2, 2009 4:50:52 PM Subject: Re: [R] How to speed up R with version 2.9.2? Its under 5 seconds on my Vista laptop. Do you have any startup files? If Rgui --vanilla is much faster then your startup files are the problem. On Fri, Oct 2, 2009 at 11:45 AM, FMH kagba2...@yahoo.com wrote: Thank you for your answer. I'm using Win XP with 2GB RAM in memory. Cheers Fir - Original Message From: stephen sefick ssef...@gmail.com To: FMH kagba2...@yahoo.com Cc: r-help@r-project.org Sent: Fri, October 2, 2009 4:38:10 PM Subject: Re: [R] How to speed up R with version 2.9.2? You're fine, but please do read the posting guide. What OS etc. Where you doing anything else on the computer? Is this a RAM limitation? I have 2.9.2 running on two flavours of linux, mac os x and windows all 2.9.2 and there doesn't seem to be a problem. regards, Stephen On Fri, Oct 2, 2009 at 10:35 AM, FMH kagba2...@yahoo.com wrote: Dear All, I'm sorry if my question does not suit with this R group. I have recently installed R software with version 2.9.2, but i found the program took almost 1 minute as soon as it was opened, before it can be used. However, the previous version 2.9.1 only take few seconds after the menu bar was clicked. This circumstance has caused me to wait for couple of minutes as several R windows were opened simultaneously. Are there any ways to speed up on this 2.9.2 version? Could someone give some hints, please? Thank you Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Stephen Sefick Let's not spend our time and resources thinking about things that are so little or so large that all they really do for us is puff us up and make us feel like gods. We are mammals, and have not exhausted the annoying little problems of being mammals. -K. Mullis __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Color of the plot which correspond to the group of the observations
Dear All, Let: dp: depth of the river tp: temperature with respect to depth These pair of observations are in 3 different groups i.e: Obs. 1,3,5,7 from the first group Obs. 2,4 and 10 from second group Obs 6,8 and 9 from third group. We can have a simple scatter plot, between depth as y-axis and temperature as x-axis, with each pairs are denoted by a red dot, by using a plot function shown below. # dp - c(1,4,3,2,5,7,9,8,9,2) tp - 1:10 plot(tp,dp, type= 'p', col = 'red') # Could someone please give some advices on the way to have a plot in which the color of each pair of observation corrrespond to its group? For instance, we might have red, blue and green dots corresponding to groups 1,2 and 3, respectively. Thank you Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Problem in graph plotting
Dear All, Let: dp: depth of the river tp: temperature with respect to depth We can have a simple scatter plot, between depth as y-axis and temperature as x-axis, by using a plot function as shown below. # dp - c(1,4,3,2,5,7,9,8,9,2) tp - 1:10 plot(tp,dp, type= 'l') # Could someone advice me on the way to plot the same pair of observations, but with depth in descending order from the origin. Instead of depth, I tried to simply use rev(depth), but the result was bizarre. Thank you Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] How to combine matrices?
Dear All, Let a, b and c are three matrices with same no. of column but different no. of row. a - matrix(1, 1, 2) b - matrix(2, 2, 2) c - matrix(3, 3, 2) Could someone help me to combine these matrices together as a single matrix? Thank you Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] How to sort the elements in a matrix?
Dear All, Let ab is the combination of matrices a and b. a - matrix(c(1,2,3,4), nrow = 2, ncol = 2) b - matrix(c(4,3,1,2), nrow = 2, ncol = 2) ab - rbind(a, b) From matrix ab, could someone give some advice on the way to sort all elements in column 2, by the sequence of the elements in column 1 in ascending order? Thank you. Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Derivative of nonparametric curve
Thank you
- Original Message
From: spencerg spencer.gra...@prodsyse.com
To: Liaw, Andy andy_l...@merck.com
Cc: Rolf Turner r.tur...@auckland.ac.nz; FMH kagba2...@yahoo.com;
r-help@r-project.org
Sent: Wednesday, September 9, 2009 3:08:43 PM
Subject: Re: [R] Derivative of nonparametric curve
This may be overkill for your application, but you might be interested in
the fda package, for which a new book appeared a couple of months ago:
Functional Data Analysis with R and Matlab (Springer Use R! series, by
Ramsay, Hooker and Graves; I'm the third author). The package includes a
scripts subdirectory with R code to recreate all but one of the 76 figures in
the book. [To find this scripts directory, use system.file('scripts',
package='fda').]
Functional data analysis generalizes spline smoothing in two important
ways:
(1) It supports the use of an arbitrary finite basis set to
approximate elements of a function space; spline smoothing uses splines only,
usually cubic splines. The first derivative of a cubic spline is piecewise
quadratic, and the second derivative is piecewise linear. If you want
something smoother than linear, you need at least a quartic spline, and Ramsay
has recommended quintics -- degree 5 polynomials = order 6 spline.
(2) It allows the curve to be smoothed using an arbitrary linear
differential operator, not just the second derivative. This can be important
if you have theory saying that the truth should follow a particular
differential equation. Otherwise, if you want to estimate the second
derivative, Ramsay has recommended smoothing with the fourth derivative rather
than the second. (In any event, smoothing is achieved by penalized least
squares with the penalty being proportional to the integral of the square of
the chosen linear differential operator.)
To reinforce this second point, chapter 11 of Functional Data Analysis
with R and Matlab describes functional differential analysis, which will
estimate non-constant coefficients in a differential equation model.
Hope this helps. Spencer Graves
Liaw, Andy wrote:
From: Rolf Turner
On 8/09/2009, at 9:07 PM, FMH wrote:
Dear All,
I'm looking for a way on computing the derivative of first and second
order of a smoothing curve produced by a nonprametric regression. For
instance, if we run the R script below, a smooth nonparametric regression
curve is produced.
provide.data(trawl)
Zone92 - (Year == 0 Zone == 1)
Position - cbind(Longitude - 143, Latitude)
dimnames(Position)[[2]][1] - Longitude - 143
sm.regression(Longitude, Score1, method = aicc, col = red, model =
linear)
Could someone please give some hints on the way to find the derivative on
the curve at some points ?
See
?smooth.spline
and
?predict.smooth.spline
Since sm.regression() (from the sm package, I presume) uses kernel
methods, a kernel-based estimator of derivatives is available in the
KernSmooth package.
Andy
cheers,
Rolf Turner
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-- Spencer Graves, PE, PhD
President and Chief Operating Officer
Structure Inspection and Monitoring, Inc.
751 Emerson Ct.
San José, CA 95126
ph: 408-655-4567
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Re: [R] Color index in image function
Thank you
From: Henrique Dallazuanna www...@gmail.com
Cc: r-help@r-project.org
Sent: Sunday, September 6, 2009 4:30:14 PM
Subject: Re: [R] Color index in image function
Try this to see which colors the codes are:
Color - function(color){
z - matrix(1:length(color), ncol = length(color))
image(y = seq(1, length(color)),
z, col = color, axes = FALSE)
text(0, y = z, labels = color, pos = 1, offset = 0, cex = 0.7)
}
Color(topo.colors(5))
Color(terrain.colors(10))
You can use levelplot from lattice package too.
Hi,
Thank you for your response. I'm looking for the names of the colors denoted
by these codes and what do these colors represent for.
For instance, if we use topo.colors(5) in the image function, five different
colors will be used in which its codes are denoted as:
[1] #4C00 #004C #00E5 #00FF4DFF #00FF
So, my first question is what type of color do these codes represent for? Are
they white, red,...?
My second question is, if we use this topo.colors(5) in image function to
denote the temperature values for intance, what are these colors represent
for? Does the first color, #4C00 represent the lower/medium/higher
temperature?
I do hope you could advice me on this matter?
Thank you
Fir
- Original Message
To: Steve Lianoglou mailinglist.honey...@gmail.com
Sent: Sunday, September 6, 2009 3:41:02 PM
Subject: Re: [R] Color index in image function
Hi,
Thank you for your response. I'm looking for the name of the colors denoted by
this code and what are these colors representing for.
For instance, if we use topo.colors(5) in the image function, five different
colors will be used in which its codes are denoted as:
[1] #4C00 #004C #00E5 #00FF4DFF #00FF
So, my first question is what type of color does these codes represent
for? Are they white, red,...?
My second question is, if we use this topo.colors(5) in image function to
denote the temperature values for intance, what are these colors represent
for? Does the first color, #4C00 represent the lower/medium/higher
temperature?
I do hope you could advice me on this matter?
Thank you
Fir
- Original Message
From: Steve Lianoglou mailinglist.honey...@gmail.com
Cc: r-help@r-project.org
Sent: Sunday, September 6, 2009 3:20:25 PM
Subject: Re: [R] Color index in image function
Hi,
Dear All,
I was looking for the color index in image function, such as from
topo.colors(n) and etc. but still never found it. For instance, from the
help menu.
The answer is in the code:
###
# Volcano data visualized as matrix. Need to transpose and flip
# matrix horizontally.
image(t(volcano)[ncol(volcano):1,])
# A prettier display of the volcano
x - 10*(1:nrow(volcano))
y - 10*(1:ncol(volcano))
image(x, y, volcano, col = terrain.colors(100), axes = FALSE)
Right here:
R terrrain.colors(100)
[1] #00A600FF #03A700FF #07A800FF #0AAA00FF #0EAB00FF ...
Is that what you mean?
-steve
--
Steve Lianoglou
Graduate Student: Computational Systems Biology
| Memorial Sloan-Kettering Cancer Center
| Weill Medical College of Cornell University
Contact Info: http://cbio.mskcc.org/%7Elianos/contact
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--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40 S 49° 16' 22 O
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Re: [R] Data in Array
Thank you - Original Message From: jim holtman jholt...@gmail.com To: FMH kagba2...@yahoo.com Cc: Schalk Heunis schalk.heu...@enerweb.co.za; r-help@r-project.org Sent: Tuesday, September 8, 2009 3:45:09 PM Subject: Re: [R] Data in Array Not sure what you mean by 'store', but you can use a list: a - matrix(1, nrow = 5, ncol = 1) b - matrix(2, nrow = 10, ncol = 1) c - matrix(3, nrow = 15, ncol = 1) myList - list(a, b, c) str(myList) List of 3 $ : num [1:5, 1] 1 1 1 1 1 $ : num [1:10, 1] 2 2 2 2 2 2 2 2 2 2 $ : num [1:15, 1] 3 3 3 3 3 3 3 3 3 3 ... myList[[2]] [,1] [1,] 2 [2,] 2 [3,] 2 [4,] 2 [5,] 2 [6,] 2 [7,] 2 [8,] 2 [9,] 2 [10,] 2 On Tue, Sep 8, 2009 at 8:14 AM, FMHkagba2...@yahoo.com wrote: Yes, but what actually i want to have is an array that might store these different matrices. - Original Message From: Schalk Heunis schalk.heu...@enerweb.co.za To: FMH kagba2...@yahoo.com Cc: r-help@r-project.org Sent: Tuesday, September 8, 2009 11:16:29 AM Subject: Re: [R] Data in Array have you tried rbind? On Tue, Sep 8, 2009 at 11:16 AM, FMHkagba2...@yahoo.com wrote: Dear All, I have some data which were stored in few matrices with different orders. Let have three different matrices a, b and c, which have the same number of column but different number of row. a - matrix(1, nrow = 5, ncol = 1) b - matrix(2, nrow = 10, ncol = 1) c - matrix(3, nrow = 15, ncol = 1) How could i put all these matrices in an array? Thank you Kagba __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve? __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] gridlines in contour plot
Dear All,
Someone suggesting me to use the filled.contour function to plot the image
together with the color index, and an example from the help menu is show below.
#
require(grDevices) # for colours
filled.contour(volcano, color = terrain.colors, asp = 1)# simple
x - 10*1:nrow(volcano)
y - 10*1:ncol(volcano)
filled.contour(x, y, volcano, color = terrain.colors,
plot.title = title(main = The Topography of Maunga Whau,
xlab = Meters North, ylab = Meters West),
plot.axes = { axis(1, seq(100, 800, by = 100))
axis(2, seq(100, 600, by = 100)) },
key.title = title(main=Height\n(meters)),
key.axes = axis(4, seq(90, 190, by = 10)))# maybe also asp=1
#
I am still trying to draw several gridlines with 10m gaps, which might
represent the height of the mountain on the image but still can't manage it.
Could someone please give some hints?
Thank you
Fir
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[R] Derivative of nonparametric curve
Dear All, I'm looking for a way on computing the derivative of first and second order of a smoothing curve produced by a nonprametric regression. For instance, if we run the R script below, a smooth nonparametric regression curve is produced. provide.data(trawl) Zone92 - (Year == 0 Zone == 1) Position - cbind(Longitude - 143, Latitude) dimnames(Position)[[2]][1] - Longitude - 143 sm.regression(Longitude, Score1, method = aicc, col = red, model = linear) Could someone please give some hints on the way to find the derivative on the curve at some points ? Thank you. Kagba __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Data in Array
Dear All, I have some data which were stored in few matrices with different orders. Let have three different matrices a, b and c, which have the same number of column but different number of row. a - matrix(1, nrow = 5, ncol = 1) b - matrix(2, nrow = 10, ncol = 1) c - matrix(3, nrow = 15, ncol = 1) How could i put all these matrices in an array? Thank you Kagba __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Data in Array
Yes, but what actually i want to have is an array that might store these different matrices. - Original Message From: Schalk Heunis schalk.heu...@enerweb.co.za To: FMH kagba2...@yahoo.com Cc: r-help@r-project.org Sent: Tuesday, September 8, 2009 11:16:29 AM Subject: Re: [R] Data in Array have you tried rbind? On Tue, Sep 8, 2009 at 11:16 AM, FMHkagba2...@yahoo.com wrote: Dear All, I have some data which were stored in few matrices with different orders. Let have three different matrices a, b and c, which have the same number of column but different number of row. a - matrix(1, nrow = 5, ncol = 1) b - matrix(2, nrow = 10, ncol = 1) c - matrix(3, nrow = 15, ncol = 1) How could i put all these matrices in an array? Thank you Kagba __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Color index in image function
Thank you for the tips. I have manage to run your script, but was still never get the way to include the color index beside the image which could explain the intensity of the color from the lower index(green) to the higher index(blue). This color index might be represented by an increasing of color index in another table beside the image, started from green followed by green-yellow, yellow, yellow-blue and blue? Could someone please advice on this matter? Cheers Fir - Original Message From: Bernardo Rangel Tura t...@centroin.com.br To: FMH kagba2...@yahoo.com Sent: Monday, September 7, 2009 11:13:12 AM Subject: Re: [R] Color index in image function On Sat, 2009-09-05 at 04:14 -0700, FMH wrote: Dear All, I was looking for the color index in image function, such as from topo.colors(n) and etc. but still never found it. For instance, from the help menu. ### # Volcano data visualized as matrix. Need to transpose and flip # matrix horizontally. image(t(volcano)[ncol(volcano):1,]) # A prettier display of the volcano x - 10*(1:nrow(volcano)) y - 10*(1:ncol(volcano)) image(x, y, volcano, col = terrain.colors(100), axes = FALSE) contour(x, y, volcano, levels = seq(90, 200, by = 5), add = TRUE, col = peru) axis(1, at = seq(100, 800, by = 100)) axis(2, at = seq(100, 600, by = 100)) box() title(main = Maunga Whau Volcano, font.main = 4) # From the script above, it yields a beautiful image of volcano with variety of colors but i have to list down the color index that could show the meaning of each color in my thesis. Could someone please help me to extract this color index? Thank you Fir If I understand your question you need change the Palette of image plot. So you need use colorRampPalette look my example Brazilan.Pallete - colorRampPalette(c(green,yellow, blue)) image(x, y, volcano, col = Brazilan.Pallete(50), axes = FALSE) -- Bernardo Rangel Tura, M.D,MPH,Ph.D National Institute of Cardiology Brazil __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Color index in image function
Hi, Thank you for your response. I'm looking for the names of the colors denoted by these codes and what do these colors represent for. For instance, if we use topo.colors(5) in the image function, five different colors will be used in which its codes are denoted as: [1] #4C00 #004C #00E5 #00FF4DFF #00FF So, my first question is what type of color do these codes represent for? Are they white, red,...? My second question is, if we use this topo.colors(5) in image function to denote the temperature values for intance, what are these colors represent for? Does the first color, #4C00 represent the lower/medium/higher temperature? I do hope you could advice me on this matter? Thank you Fir - Original Message From: FMH kagba2...@yahoo.com To: Steve Lianoglou mailinglist.honey...@gmail.com Sent: Sunday, September 6, 2009 3:41:02 PM Subject: Re: [R] Color index in image function Hi, Thank you for your response. I'm looking for the name of the colors denoted by this code and what are these colors representing for. For instance, if we use topo.colors(5) in the image function, five different colors will be used in which its codes are denoted as: [1] #4C00 #004C #00E5 #00FF4DFF #00FF So, my first question is what type of color does these codes represent for? Are they white, red,...? My second question is, if we use this topo.colors(5) in image function to denote the temperature values for intance, what are these colors represent for? Does the first color, #4C00 represent the lower/medium/higher temperature? I do hope you could advice me on this matter? Thank you Fir - Original Message From: Steve Lianoglou mailinglist.honey...@gmail.com To: FMH kagba2...@yahoo.com Cc: r-help@r-project.org Sent: Sunday, September 6, 2009 3:20:25 PM Subject: Re: [R] Color index in image function Hi, On Sat, Sep 5, 2009 at 7:06 AM, FMHkagba2...@yahoo.com wrote: Dear All, I was looking for the color index in image function, such as from topo.colors(n) and etc. but still never found it. For instance, from the help menu. The answer is in the code: ### # Volcano data visualized as matrix. Need to transpose and flip # matrix horizontally. image(t(volcano)[ncol(volcano):1,]) # A prettier display of the volcano x - 10*(1:nrow(volcano)) y - 10*(1:ncol(volcano)) image(x, y, volcano, col = terrain.colors(100), axes = FALSE) Right here: R terrrain.colors(100) [1] #00A600FF #03A700FF #07A800FF #0AAA00FF #0EAB00FF ... Is that what you mean? -steve -- Steve Lianoglou Graduate Student: Computational Systems Biology | Memorial Sloan-Kettering Cancer Center | Weill Medical College of Cornell University Contact Info: http://cbio.mskcc.org/~lianos/contact __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Color index in image function
Dear All, I was looking for the color index in image function, such as from topo.colors(n) and etc. but still never found it. For instance, from the help menu. ### # Volcano data visualized as matrix. Need to transpose and flip # matrix horizontally. image(t(volcano)[ncol(volcano):1,]) # A prettier display of the volcano x - 10*(1:nrow(volcano)) y - 10*(1:ncol(volcano)) image(x, y, volcano, col = terrain.colors(100), axes = FALSE) contour(x, y, volcano, levels = seq(90, 200, by = 5), add = TRUE, col = peru) axis(1, at = seq(100, 800, by = 100)) axis(2, at = seq(100, 600, by = 100)) box() title(main = Maunga Whau Volcano, font.main = 4) # From the script above, it yields a beautiful image of volcano with variety of colors but i have to list down the color index that could show the meaning of each color in my thesis. Could someone please help me to extract this color index? Thank you Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Color index in image function
Dear All, I was looking for the color index in image function, such as from topo.colors(n) and etc. but still never found it. For instance, from the help menu. ### # Volcano data visualized as matrix. Need to transpose and flip # matrix horizontally. image(t(volcano)[ncol(volcano):1,]) # A prettier display of the volcano x - 10*(1:nrow(volcano)) y - 10*(1:ncol(volcano)) image(x, y, volcano, col = terrain.colors(100), axes = FALSE) contour(x, y, volcano, levels = seq(90, 200, by = 5), add = TRUE, col = peru) axis(1, at = seq(100, 800, by = 100)) axis(2, at = seq(100, 600, by = 100)) box() title(main = Maunga Whau Volcano, font.main = 4) # From the script above, it yields a beautiful image of volcano with variety of colors but i have to list down the color index that could show the meaning of each color in my thesis. Could someone please help me to extract this color index? Thank you Fir __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Differentiation on mathematical equation
Dear All, I was trying to compute the first and second order differentiation on a number of mathematical equations, but never found any command in R to do this operation. At present, i have almost 3000 different functions, consist of polynomial, harmonic and several other functions. Could someone please help me? Thank you Firdaus __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] contour plot
Hi, Could someone give some ideas on plotting a contour by using geoR package, please? Thank you Kagba [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Problem with GroupedData
Hi, I have an original data frame with 8 columns of variables, which are stored in 'data1' frame. data1 - read.csv(E:\\PHD GLASGOW UNIVERSITY\\Data\\R\\Colin\\Cailness21.csv) attach(data1) names(data1) [1] Date d m y Time [6] Depth Temp Group_Time Recently, i try two add a column into this data frame, but when i try to use the 'groupedData' function with this new data frame via command below, it reported the problem stated after the command below. library(nlme) tmp - groupedData(Temp ~ d | Depth, data2, order.groups = TRUE, labels = list(x = Month, y = Temperature), units = list(y = 0C)) Error in nfGroupedData(formula = Temp ~ d | Depth, data = data2, order.groups = TRUE, : second argument to groupedData must inherit from data.frame Could someone help me to sort out on this problem, please? Thank you Fir [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] standard error and p-value for the estimated parameter in AR model
Dear All, I used an AR(1) model to explain the process of the stationary residual and have used an 'ar' command in R. From the results, i tried to extract the standard error and p-value for the estimated parameter, but unfortunately, i never find any way to extract it from the output. What i did was, i assigned the residuals into the 'residual' object in R and used an 'ar' function as below. residual - residuals ar(residual, aic = TRUE, method = mle, order.max = 1) Could someone help me to extract the stadard error and the p-value for the estimated parameter, please? Thank you Fir [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] p-value for the parameter in ARIMA model with R
Dear All, I decided to use an AR(1) model for the residual series and trying to find the p-value for each parameter by using arima command in R, but i never find it from the output. The output gives me the parameter and mean's value, its standard error, estaimated variance, AIC and loglikehood, but no p-value is given. What i did was, i assign the residuals into the 'residual' variable in R, i then use' arima(residual, order = c(1,0,0))' to compute the parameter and mean values. Could someone help me? Thank you Fir [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Correlation structure in AR(2) and ARMA(p,q)
Hi, Let theta be the coefficient in AR(1) model, the components of the correlation structure is equal to 1 for times s = t, and theta^|t-s| for t s. Could someone do me a favour to give some ideas on the correlation structure in AR(2) model and correlation structure of ARMA(p,q), as well? Thank you Fir [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Spatiotemporal correlation function
Hi, I'm trying to compute the spatiotemporal correlation matrix by using Delta Kronecker products of spatial and temporal correlation matrix in R, but didn't find any delta Kronecker's operator in R. The operators in matrix such as multiplication, addition, eigen values/vector and etc is easily to find and used. Could someone help me, please? Cheers. Firdaus [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Delta Kronecker
Hi, Could some give some ideas on how to compute the spatiotemporal covariance matrix by a sum of Kronecker products in R. Is there any special function that can be used? Cheers. Firdaus [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
