[R] igraph problem

Run this code tree<-graph_from_literal(1-+2:3,3-+5,1-+4); graph.bfs(tree,root=1, neimode="out",father=TRUE,order=TRUE,unreachable = FALSE) I do not understand why the father values will give NA 1 1 3 1 rather than NA 1 1 1 3 The reason I am doing this is to obtain the values(by vertex names) or

Re: [R] symbolic computing example with Ryacas

Here are some more examples: library(Ryacas) x <- Sym("x") yacas("x:=2") Eval(x*x) ## [1] 4 # vignette has similar example y <- Sym("y") Eval(Subst(y*y, y, 3)) ## [1] 9 # demo("Ryacas-Function") has similar example to this f <- function(z) {} body(f) <- yacas(expression(z*z))[[1]] f(4) ## [1]

[R] Graph f(x) = 1/x

Dear All: good morning I am trying to graph the function y=f(x)=1/x over the interval (-5,5). But I am getting an error message. Please see below. I am getting the error message: *Error in xy.coords(x, y, xlabel, ylabel, log) : * * 'x' and 'y' lengths differ* x x <- seq(-5, 5, 0.01) y < 1/x

Re: [R] Graph f(x) = 1/x

On Tue, 19 Sep 2017, AbouEl-Makarim Aboueissa wrote: Dear All: good morning I am trying to graph the function y=f(x)=1/x over the interval (-5,5). But I am getting an error message. Please see below. I am getting the error message: *Error in xy.coords(x, y, xlabel, ylabel, log) : * * 'x'

Re: [R] Graph f(x) = 1/x

Dear Zeileis: Thank you very much abou On Tue, Sep 19, 2017 at 4:13 AM, Achim Zeileis wrote: > > > On Tue, 19 Sep 2017, AbouEl-Makarim Aboueissa wrote: > > Dear All: good morning >> >> I am trying to graph the function y=f(x)=1/x over the interval (-5,5). But >> I am

Re: [R] Graph f(x) = 1/x

It's always good to start a new session when you don't understand what's wrong, because sometimes your code is correct, but you use old data without knowing it :) Ivan -- Dr. Ivan Calandra TraCEr, Laboratory for Traceology and Controlled Experiments MONREPOS Archaeological Research Centre and

[R] Extracting Europe from a netCDF file

Dear ALL, I was trying to extract the data only for european region from this file https://www.dropbox.com/s/xpo7zklcmtm3g5r/gfdl_preci.nc?dl=0 using these points (-10.375, 35.125), (43.375, 35.125), (-10.375, 71.375), (43.375, 71.375). However, I am not sure how I can proceed further. I have

Re: [R] Graph f(x) = 1/x

Hello, I believe that the easiest way is curve(1/x, -5, 5) Also, you're missing a '-' in y < 1/x, it should be y <- 1/x Hope this helps, Rui Barradas Citando AbouEl-Makarim Aboueissa : Dear All: good morning I am trying to graph the function y=f(x)=1/x over

[R] symbolic computing example with Ryacas

Hi all, I am trying to implement the following matlab code with Ryacas : syms U x x0 C d1=diff(U/(1+exp(-(x-x0)/C)),x); pretty(d1) d2=diff(U/(1+exp(-(x-x0)/C)),x,2); pretty(d2) solx2 = solve(d2 == 0, x, 'Real', true) pretty(solx2) slope2=subs(d1,solx2) I have tried the following :

[R] Network meta-analysis help

Greetings. I hope my message finds you well. I know this question may be silly for some experts like you but it's a very important matter for me so, sorry for that. I was trying to make a network meta-analysis using R for the attached data set which shows the association between breast feeding

[R] remove quotes from matrix

Hi all; I have data at 734*22 dimensions with rows and columns names are non-numeric.When I convert this data into matrix then all values show up with quotes. Then when I use x1= noquotes(x) to remove the quotes from the matrix then non-numeric row names remain all other values in matrix

Re: [R] symbolic computing example with Ryacas

Have you studied the "Introduction to Ryacas" vignette that come with the package? Cheers, Bert Bert Gunter "The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) On Tue, Sep 19,

Re: [R] remove quotes from matrix

On 19/09/2017 9:47 AM, greg holly wrote: Hi all; I have data at 734*22 dimensions with rows and columns names are non-numeric.When I convert this data into matrix then all values show up with quotes. Then when I use x1= noquotes(x) to remove the quotes from the matrix then non-numeric row names

Re: [R] remove quotes from matrix

Hi Duncan and Bert; I do appreciate for your replies. I just figured out that after x1= noquotes(x) commend my 733*22 matrix returns into n*1 vector. Is there way to keep this as matrix with the dimension of 733*22? Regards, Greg On Tue, Sep 19, 2017 at 10:04 AM, Duncan Murdoch

Re: [R] remove quotes from matrix

Your claims are false -- or at least confused. > d <- data.frame(a = I(letters[1:3]), b = 1:3) ## the I() is to prevent automatic conversion to factor > d a b 1 a 1 2 b 2 3 c 3 > dm <- as.matrix(d) > dm a b [1,] "a" "1" [2,] "b" "2" [3,] "c" "3" > dimnames(dm) [[1]] NULL [[2]] [1] "a"

Re: [R] remove quotes from matrix

Dear all; Thanks. Here are the dput results as Duncan suggested. Regards, Greg structure(list(Sub_Pathways = structure(c(3L, 3L, 3L, 3L, 3L), .Label = c("Acetylated_Peptides", "Advanced_Glycation_End-product", "Alanine_and_Aspartate", "Aminosugar", "Ascorbate_and_Aldarate", "Carnitine",

Re: [R] remove quotes from matrix

Works fine for me. What do you object to in the following? Calling the above df "d", > dm <- as.matrix(d) > dm Sub_PathwaysBMI_beta SAT_beta VAT_beta 1 "Alanine_and_Aspartate" " 0.23820" "-0.02409" " 0.94180" 2 "Alanine_and_Aspartate" "-0.31300" "-1.97510" "-2.22040" 3

Re: [R] remove quotes from matrix

Hi Bert; I sincerely appreciate for this. When I follow your way I have got dimnames(dm) [[1]] NULL I think this is the reason why the matrix is being converted into a column vector. Regards, Greg On Tue, Sep 19, 2017 at 11:32 AM, Bert Gunter wrote: > Works fine for

Re: [R] remove quotes from matrix

Your description was confusing. You do not have row names that are non-numeric: > str(dta) 'data.frame': 5 obs. of 5 variables: $ Sub_Pathways: Factor w/ 79 levels "Acetylated_Peptides",..: 3 3 3 3 3 $ BMI_beta: num 0.2382 -0.313 0.1238 0.3035 -0.00982 $ SAT_beta: num -0.0241

Re: [R] remove quotes from matrix

Greg, I think you should stop using noquote, because it is doing something that will not be useful to you for preparing your data for analysis. Please follow Duncan's advice and provide us with a sample of your data. Also, please set your email program to send plain text rather than HTML

Re: [R] symbolic computing example with Ryacas

Thanks for the response. Yes, I did study the vignette but did not understand it fully. Anyway, I have tried once again now. I am happy to say that I have got what I wanted. library(Ryacas) x <- Sym("x");U <- Sym("U");x0 <- Sym("x0");C <- Sym("C") my_func <- function(x,U,x0,C) { return