Xu Jun wrote:
I am trying to graph a 3-D graph of simulated data for logit models using
the powerful wireframe command, but I got stuck. Here are the codes:
x - seq(-4, 4, by=0.01)
y - seq(-4, 4, by=0.01)
p - 1/(1+exp(-0.12*x + 0.35*y))
mydata - cbind(x, y, p)
require(lattice)
Kon Knafelman konk2001 at hotmail.com writes
I need to use netwon's method to find the root of a polynomial, ..
It't time to get your homework date May 12 submitted.
http://markmail.org/message/x5vdbync3gxfs5hp
Dieter
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MikSmith mike at hsm.org.uk writes:
I'm trying to write a generic script for processing some data which finishes
off with some plots. Given Im never sure how many columns will be in my
dataframe I wanted to using the following
plot(spectra.wavelength, cormat, type = l, ylim=c(-1,1),
Hey Guys,
i need 1000 samples of size 15, for distributions of Exp(1) and Norm(0,1). here
is what i have done so far.For the exponential
z-list()
for(i in 1:1000){z[[i]]=rexp(15,1)}
For the Normal
y-list()
for(i in 1:1000){y[[i]]=rnorm(15,0,1)}
Is this correct?
after this i need to
Hi
This *must* be an insanely easy thing to work out, but I'm not too familiar
with R syntax. So how do I work out the row number (if I pass a column) of
the minimum value?? I can get the value itself from min(), but where can I
get the row??
Many thanks
mike
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Hi,
Can anyone advise on the most appropriate way to use the Croston's function
in the Forecast package. I have high intermittent demand and am interested
in predicting sales trends. Is this possible? What is meant by this
statement in the help file: Note that prediction intervals are not
can someone please help me with this problem.
i found the density and distribution for the Kumar~(2.3,3.2), but now im
stuck on the quantile. how do i determine the quantile for kumar with
Inverse F(0.5).
im trying to use qkumar(_,2.3,3.2). but im stuck on determing the
probability vector.
Hi Mike,
On Sunday 17 May 2009, MikSmith wrote:
Hi
This *must* be an insanely easy thing to work out, but I'm not too familiar
with R syntax. So how do I work out the row number (if I pass a column) of
the minimum value?? I can get the value itself from min(), but where can I
get the row??
Hi R-users,
Where can I find the code for asymmetric t-copula in R?
Thank you for any help given.
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At 15:46 15/05/2009, Liviu Andronic wrote:
Dear all,
I'm trying to gsub() % with \% with no obvious success.
Hello Liviu,
When I posted a similar question a few years ago one helpful response
introduced me to nchar
nchar(%)
[1] 1
nchar(\%)
[1] 1
Warning messages:
1: '\%' is an unrecognized
On Sun, May 17, 2009 at 5:00 PM, Thomas Mang thomas.m...@fiwi.at wrote:
Hi,
Well, also not quite.
Suppose x = 5.001 (in finite binary represenation). Then I want x ==
5, but that is of course an integer which is now less than the original
numeral.
Sorry for that I haven't got what
Try:
as.integer(x + 0.5)
assuming the calculation error is less than 0.5 .
On Sat, May 16, 2009 at 2:49 PM, Thomas Mang thomas.m...@fiwi.at wrote:
Hello,
Suppose I have x, which is a variable of class numeric. The calculations
performed to yield x imply that mathematically it should be an
Hi,
The problem is, x might be negative. If x == -6.999, the result
should be -7, not -6. That's why my original proposal had the
ifelse-condition (one could alternatively write sign(x) * 0.5, BTW.
I agree however that in my proposal, the round(x) is redundant, one can
use x itself as
Try this:
as.integer(x + sign(x) * .5)
On Sun, May 17, 2009 at 6:01 AM, Thomas Mang thomas.m...@fiwi.at wrote:
Hi,
The problem is, x might be negative. If x == -6.999, the result should
be -7, not -6. That's why my original proposal had the ifelse-condition (one
could alternatively
Hi Stephanie
Absolutely right! My CSV was imported as a factor. Reading the R FAQ:
http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-do-I-convert-factors-to-numeric_003f
I actually need to do:
as.numeric(as.character(spectra.wavelength))
to get back to my original data.
Many thanks for the
Hi Adrian
Many thanks. That works perfectly! It's easy when you know the answer :)
mike
Adrian Dusa wrote:
Hi Mike,
On Sunday 17 May 2009, MikSmith wrote:
Hi
This *must* be an insanely easy thing to work out, but I'm not too
familiar
with R syntax. So how do I work out the row
Hi,
'revdep-rebuild' under GENTOO shows me
that /usr/lib64/R/library/tkrplot/libs/tkrplot.so, which was installed
at April 24th, is broken.
'ldd /usr/lib64/R/library/tkrplot/libs/tkrplot.so' shows me that
tkrplot.so needs libtcl8.4.so and libtk8.4.so, which is no more
installed since the
Having some way to specify strings which does not involve special
interpretation of backslashes is a frequent wish list item that
would be helpful for latex, Windows path names and regular
expressions. A review of delimiter collision approaches by
different languages can be found here:
Adrian Dusa wrote:
Hi Mike,
On Sunday 17 May 2009, MikSmith wrote:
Hi
This *must* be an insanely easy thing to work out, but I'm not too familiar
with R syntax. So how do I work out the row number (if I pass a column) of
the minimum value?? I can get the value itself from min(), but where
Ben,
Thank you for your help!
Jun
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and provide
Dimitri Liakhovitski wrote:
Hello!
I promise I looked into help files before asking. Still cannot figure
it out. I think it's because I am totally confused what packages use
lettice, which use trellis, etc.
Sections 1 and 2 below produce the data and the data to plot. My
question is about
Dear R users,
I incurred some problems with importing data into R.
i.e. If I want to import a text file or word file which contains lots of
numerical numbers, what function should I use?
Please help.
Thanks a lot.
Debbie
Debbie Zhang schrieb:
Dear R users,
I incurred some problems with importing data into R.
i.e. If I want to import a text file or word file which contains lots of
numerical numbers, what function should I use?
It does help if you read the posting guide first. In general, the file
has to
On my machine the 10^1 tick mark does not show up.
sessionInfo()
R version 2.9.0 (2009-04-17)
i386-apple-darwin8.11.1
locale:
en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached
There is no reason to think it would
show up since its outside the range
of your data.
Use ylim to expand the range of the
axis if you want it.
On Sun, May 17, 2009 at 10:29 AM, Afshartous, David
dafshart...@med.miami.edu wrote:
On my machine the 10^1 tick mark does not show up.
Thanks to Dieter Menne and Spencer Graves I started to get my way through
lsoda()
Now I need to use it in the nls() to assess the parameter.
I've tried with a basic example
dy/dt = K1*conc
I try to assess the value of K1 from a simulated data set with a K1 close to
2.
I'm not sure that I'm
I am interested in studying the binary representation of numerics
(doubles) in R, so am looking for possibilities of output of the
internal binary representations. sprintf() with format a or A
is halfway there:
sprintf(%A,pi)
# [1] 0X1.921FB54442D18P+1
but it is in hex.
The following
I was trying to produced bagged importance estimates of attributes in earth
using the caret package with the following commands:
fit2 - bagEarth(loyalty ~ ., data=model1, B = 10)
bagImpGCV - varImp(fit2,value=gcv)
My bootstrap estimates are produced however the second command varImp
You might want to try using a non-parametric test, such as wilcox.test.
How about some modification of the following:
d=data.frame(grp=rep(1:2,e=5),replicate(10,rnorm(100))); head(d)
lapply(d[,-1],function(.column)wilcox.test(.column~grp,data=d))
David Freedman
stephen sefick wrote:
Up
gsubfn of the gsubfn package is like gsub but can take a function,
list or proto object
as the replacement instead of a character string and with a list it
can be used to
readily turn hex to binary:
library(gsubfn)
binary.digits -
+ list(0= , 1= 0001, 2= 0010, 3= 0011,
+ 4= 0100, 5=
Search on the left under www.r-project.org provide 5 different
search engines devoted to R. The R-help archives for 4/20/2009 (+/-1
depending on your local time zone and mine) contains an interesting
discussion of this issue, Subj: Re: [R] Two or more dimensional root
(Zero) finding.
On 17 May 2009 at 12:53, Juergen Rose wrote:
| 'revdep-rebuild' under GENTOO shows me
| that /usr/lib64/R/library/tkrplot/libs/tkrplot.so, which was installed
| at April 24th, is broken.
| 'ldd /usr/lib64/R/library/tkrplot/libs/tkrplot.so' shows me that
| tkrplot.so needs libtcl8.4.so and
Dear R-users,
I have a problem in making a chi-square density function curve.
I have sth like curve(dchisq(x, df))
from help, x is vector of quantiles, df is the degree of freedom.
I do not understand what vector of quantiles is, what do I need to put in?
Thanks!
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prixel wrote:
im completely confused. could someone please help.
i have a series of data (0,0,0,0,1,1,0,0,0) and i need to create a data
frame with it. but what is a data frame?
thankyou :)
A data frame is similar to a matrix- however each column may be of a
different data type
Are you looking for how the floating point is represented in the IEEE-754
format? If so, you can use writeBin:
writeBin(pi,raw(),endian='big')
[1] 40 09 21 fb 54 44 2d 18
On Sun, May 17, 2009 at 1:23 PM, Ted Harding
ted.hard...@manchester.ac.ukwrote:
I am interested in studying the binary
Many thankis, Gabor! That looks both interesting and powerful.
Indeed, it seems to implement with one stroke what I had been
thinking of implementing piecemeal.
Best wishes,
Ted.
On 17-May-09 17:48:00, Gabor Grothendieck wrote:
gsubfn of the gsubfn package is like gsub but can take a function,
To maintain my R site, I'm trying to install html help files only, but
also keep track of the version (with DESCRIPTION). I have the
following bash script, which works except for 00Index.html. That is
not a huge problem because the help files are still searchable, but
I'd like to fix it.
A long
Hi,
Â
A question on something which normally should be easy !
Â
I perform a linear regression using lm function:
Â
reg1 - lm (a b+c+d, data = database1)
Â
Then I try to perform the Chow (1960) test (structural change test) on my
regression. I know the breakpoint date. I try the following
Thanks, Jim. While that is still in hex, I find I can get the binary
represntation using Gabor's gsubfn() function, provided the A-F isw
changed to a-f in setting up his 'binary.digits', and the output is
explicitly cast to character:
gsubfn([0-9a-f], binary.digits,
Also note that one can use toupper in place of as.character
in which case no other changes are required.
On Sun, May 17, 2009 at 5:07 PM, Ted Harding
ted.hard...@manchester.ac.uk wrote:
Thanks, Jim. While that is still in hex, I find I can get the binary
represntation using Gabor's gsubfn()
On Sun, 17 May 2009, Axel Leroix wrote:
Hi,
Â
A question on something which normally should be easy !
Â
I perform a linear regression using lm function:
Â
reg1 - lm (a b+c+d, data = database1)
Â
Then I try to perform the Chow (1960) test (structural change test) on my
regression. I know
Am Sonntag, den 17.05.2009, 13:16 -0500 schrieb Dirk Eddelbuettel:
On 17 May 2009 at 12:53, Juergen Rose wrote:
| 'revdep-rebuild' under GENTOO shows me
| that /usr/lib64/R/library/tkrplot/libs/tkrplot.so, which was installed
| at April 24th, is broken.
| 'ldd
When I type the following, I get results different from what I expected.
sprintf('%a',3)
[1] 0x1.8
Shouldn't the result be
[1] 0x1.8p+2
I read through the help ?sprintf and didn't find anything that changed my
expectation. What am I misunderstanding? I am using R-2.9.0 binary from CRAN
On 17-May-09 22:03:19, Daniel Nordlund wrote:
When I type the following, I get results different from what I
expected.
sprintf('%a',3)
[1] 0x1.8
Shouldn't the result be
[1] 0x1.8p+2
Well, not p+2 but p+1
(0x1.8 = 1.1000[2] ; *2 = 11.000[2] = 3[10]) ;
however, I get:
Hi!
I'm doing one and two sample nonparametric tests for the median using wilcox
test. For a one-sample test I use:
wilcox.test(x, mu =50 (or whatever), y=NULL,correct=TRUE)
For two-sample test I use:
wilcox.test(x,y,correct=TRUE)
The problem is when I try to duplicate problems from
Hi
Would a basic call to grid.text() do what you want here?
Paul
Paul Emberson wrote:
Hi Baptiste,
I think on this occasion I'll edit manually in inkscape with the textext
plugin which is a somewhat clumsy but simple option. Thanks for the
link to the wiki which I wasn't aware of until
-Original Message-
From: Ted Harding [mailto:ted.hard...@manchester.ac.uk]
Sent: Sunday, May 17, 2009 3:32 PM
To: Daniel Nordlund
Cc: r-help@r-project.org
Subject: RE: [R] sprintf() question
On 17-May-09 22:03:19, Daniel Nordlund wrote:
When I type the following, I get results
Dear colleagues in R,
Has anybody implemented the
1) (Goodman Kruskal) lambda
2) (Thiel's) uncertainty coefficient
Tanks
Rafael M Ramos
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Hi everyone!
I meet one problem when embedding R in C code, when I run the the R code in
one child thread ,
it always print error info:
Error: C stack usage is too close to the limit
I also try to set R_CStackLimit = (uintptr_t)-1 to disable the C stack check
as the R-ext doc
Hi R-users,
Where can I find the code for asymmetric t-copula in R?
Thank you for any help given.
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This question might been asked previously (I googled), but I can't find a
workable solution in the archives.
My question is: how to run Rcdmr in Mac Os X?
The error message when I launched Rcmdr fresh from a R session is:
Version of R:
R 2.8.1 GUI 1.27 Tiger build 32-bit (5301)
library(Rcmdr)
I know it sounds like a silly question but whenever i click on save to file
it doesn't save. whenever i use the function attach(___) it doesn't work,
and says object can not be found. i have a series of data (0,0,0,1,1) that i
need to save, then i want to attach(...) it in another R window.
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