Displaying 20 results from an estimated 11000 matches similar to: "PhD student reading list, suggestions wanted"
2004 Feb 10
4
The ttest.c example in R under MS Windows
We are trying to compile and run the ttest.c example that comes with R (in
C:\Program Files\R\rw1081\src\library\windlgs\src\ttest.c). After compiling
it with MS Visual C++ we load the DLL with dyn.load.
So far it seems good, but when we try to call it from R (after running
C:\Program Files\R\rw1081\src\library\windlgs\R\windlgs.R) R crashes.
We have tried changing the exports from DLL but have
2005 Jan 17
5
find source code
I am using R 2.0.2 on a WinXP
I am trying to get the code of the Kruskal-Wallis test but
> kruskal.test
function (x, ...)
UseMethod("kruskal.test")
<environment: namespace:stats>
> ls(3)
[1] "acf" "acf2AR" "add.scope"
..............
[181] "kruskal.test" "ks.test"
2000 Sep 13
2
minimization
Hi, I got a code from S that uses 'nlminb' to minimize a function
with constraints. Is there a similar function in R?
Thanks.
R. Heberto Ghezzo Ph.D.
Meakins-Christie Labs
McGill University
Montreal - Canada
heberto at meakins.lan.mcgill.ca
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read
2001 Dec 12
1
again evaluations
Hello, I wrote the following function to compute multiple comparisons in
a one way anova and randomized blocks anova.
aov1 <- function(y,g,s=NULL,comp="mca",meth="Sidak") {
#
fun <- function(x)
c(mean(x,na.rm=T),sd(x,na.rm=T),length(x[!is.na(x)]))
#
li <- length(unique(g))
cat(" Analysis of Variance with Multiple comparisons\n\n")
cat("
2003 Jan 29
3
na.rm in sd()
Hello, I think this qualify as a bug
> x<-c(1,2,3,4,NA,6,7)
> mean(x)
[1] NA
> mean(x,na.rm=T)
[1] 3.833333
> sd(x)
Error in var(as.vector(x)) : missing observations in cov/cor
> sd(x,na.rm=T)
Error in sd(x, na.rm = T) : unused argument(s) (na.rm ...)
> var(x)
Error in var(x) : missing observations in cov/cor
> var(x,na.rm=T)
[1] 5.366667
>
why sd() does not
2009 Jul 20
1
Argument problem in function wrapper
Dear all,
we are writing a wrapper for the nls function in library stats. We are
having a problem with one of the arguments (weightsArgument) which seems not
to reach nls even if we explicitly assign it in the function call. We are
attaching the simplest code reproducing the error and the output calling the
wrapper and calling nls directly. We are using R 2.9.0
library(stats)
wrappernls <-
2001 Apr 19
2
extraction
Hello everybody
I am trying to extract some observations from a data frame, ie the
subjects that belong to a given group, and although t-test etc work
if I try to obtain the number of subjects in the subgroup i get some
funny numbers. All the subjects with NA for group are included in
the subgroups 'group==1' etc.
Is this a bug?
for example in Windoze
R : Copyright 2001, The R
2000 Jul 26
4
differential equations
Hi, Does somebody knows of the existence of a library of functions
for solving differential equations, I need a solver for a system of non
linear first order differential equations. I think there was something
in IMSL but that was a long time ago and probably there are some
new algorithms in the new now.
Thanks for any pointers.
.
R. Heberto Ghezzo Ph.D.
Meakins-Christie Labs
McGill
2001 Mar 14
2
scan
Hello, I have a problem. I have to read a HUGE file which has to be
line processed, so I would like to use scan like
p <- scan(pfile,what=c(0,0,0,"",0,""),nlines=1)
but it continues to read the first line, so I have to add a skip and
increment the skip after each read.
It takes forever to read a test file of 1 Mb, the real one is in 60's Mb
Is there a way to read line
2000 Jun 17
2
R 1.1.0 for Windows
Windows binaries at CRAN (bin/windows/Windows-NT/base) have been updated
to R-1.1.0. See below for a list of Windows-specific changes.
We thanks all the people who checked over pre-test versions.
guido masarotto
(for the R-core team)
Windows-specific changes to R
=============================
There is now a GUI preferences editor on the Edit menu in Rgui.
A data entry editor is now
2000 Jun 17
2
R 1.1.0 for Windows
Windows binaries at CRAN (bin/windows/Windows-NT/base) have been updated
to R-1.1.0. See below for a list of Windows-specific changes.
We thanks all the people who checked over pre-test versions.
guido masarotto
(for the R-core team)
Windows-specific changes to R
=============================
There is now a GUI preferences editor on the Edit menu in Rgui.
A data entry editor is now
2010 Jun 18
4
Drawing sample from a circle
Hi, I would like to draw 10 uniformly distributed sample points from a circle with redius one and centered at (0,0). Is there any R function to do that?
Thanks,
[[alternative HTML version deleted]]
2002 Feb 04
1
read zipped files
I received several answer to my querry re reading zipped files,
R.Gentleman, Liaw Andy, BD Ripley,J Holtman, A.Matt, and others,
sorry
if I missed your names.
a- use pipe to run external unzip to a file and read from there
b- use gzfile() to open directly a gzipped file
c- use zip.file.extract()
solution b works like a charm, unfortunately it open gzipped files
and
not zipped files, would it be
2000 Apr 25
1
loops
Hi R friends,
I havent asked a silly question in a long time so here it is:
Reading the last issue of Stat Can J. there is an article in a single
degree of freedom test for non aditivity of interactions in anova
tables with 1 obs per cell. The authors claim it is more powerfull than
Tukey but for the case of multiplicative interaction, which is the
alternative studied by Tukey. I tried to
2004 Dec 20
2
problems with limma
I try to send this message To Gordon Smyth at smyth at vehi,edu.au but it bounced
back, so here it is to r-help
I am trying to use limma, just downloaded it from CRAN. I use R 2.0.1 on Win XP
see the following:
> library(RODBC)
> chan1 <- odbcConnectExcel("D:/Data/mgc/Chips/Chips4.xls")
> dd <- sqlFetch(chan1,"Raw") # all data 12000
> #
> nzw <-
2003 Mar 13
2
RODBC and Excel in Widows
Hello, I have some problems with RODBC and Excel in Win98
I am using R 1.6.2 and just upgraded RODBC to the last version on CRAN.
I have an Excel file with columns Number, Name, Sex, Age, FEV1 on Sheet
1 and Number, Age, FEV1, Name, Sex on Sheet 2.
Now I open the channel to the file
> chan1 <- odbcConnectExcel("c:/testOdbc.xls")
> tables(chan1)
and the list appears with the 2
2002 Jun 04
1
compiling packages
Hello, Using R 1051 in win98
When I try to build a library Addreg with DESCRIPTION, Index and Title
in R and subdirectories Man and R. From a Command window I do:
c:\> c:\rw1051\bin\Rcmd INSTALL c:\r_src\src\library\addreg
--library=c:\r\src\library
make: Entering directory '/cygdrive/c/rw1051/src/gnuwin32'
make DLLNM= \
-C c:/r_src/src/library/addreg PKG=addreg RHOME=c:/rw1051
1999 Nov 09
2
Problems with read.table
Hi I am using R65.1 in Windows 95
I have a CSV file from Excell
>
a<-read.table("c:/heberto/mgc/tst.csv",header=T,sep=",")
> attach(a)
> a
manolo fvcpp fevpp fvvcpp tlcpp rvpp rvtlpp plmaxpp
1 1 99.28 97.67 98.38 91.14 102.9 111.25 117.64
2 1 86.97 68.56 78.89 94.60 112.34 118.53 159.20
3 1 81.12 71.76 88.37 89.16
2001 Jul 05
3
plotting time
Hi, all. I'm trying to create a plot that has a range of about an
hour on the x axis, starting at about 10:15.
I have a way I'm currently doing it but it's not working. this is
what I want on the x axis:
|
|
|
|
|
|
|
|
|
|
----------------------------------------------
10:15 10:25 10:35 10:45 10:55 11:05 11:15
what's the best way to plot this out like this?
currently,
1998 Oct 22
1
crosstab means
I would like to obtain a crosstabulation of means(var, quantiles...)
i.e. I have a data frame with Var-i, Var-j, Var-k, Var-X, var-Y
I like to have the mean of Var-X for each combination of Var-i,Var-j.
One solution would be:
by(var-i,Var-j,mean(Var-x))
but I would like it better formatted and with mean,S.Dev,n for each
cell?
Does anybody have some function to do this or some ideas how to go