[R] Simply matrix slice question

Is there any way to force a slice of a matrix to stay a matrix? R tends to convert a single row of a matrix into a vector. Example: z<-matrix (rnorm(20), ncol=5) zz<-z[1,] is.matrix(zz) #FALSE I usually resort to: zz<-matrix(z[1,], ncol=dim(z)[2], dimnames=list(rownames(z)[1], colnames(z))

Re: [R] Checking on closed file connections

On Jul 21, 2009, at 6:40 PM, Duncan Murdoch wrote: > On 21/07/2009 5:03 PM, Jim Nemesh wrote: >> Hi! I'm wondering if there's a smart way around this: >> fileName= (some valid file on your system) >> >fileCon=file(fileName, open="rt") >>

[R] Checking on closed file connections

Hi! I'm wondering if there's a smart way around this: fileName= (some valid file on your system) >fileCon=file(fileName, open="rt") >l<-readLines (fileCon, n= 1) > > isOpen(fileCon) [1] TRUE >close(fileCon) > isOpen(fileCon) Error in isOpen(fileCon) : invalid connection How do you

[R] Help with R.oo

first time I try to construct the object it fails, and the second time it seems to work just fine? Is there something I should be doing between declaring the constructor and using the object (besides adding S3 methods?) Thanks for any help, I find this entirely confusing. -Jim Nemesh

Re: [R] Altering columns

A simple way to do it would be: mat<-mat[,c(2,1)] Slightly more fancy (for any number of columns): mat<-mat[,dim(mat)[2]:1] I'm sure there are prettier ways to do it. -Jim On Jun 18, 2009, at 4:14 PM, RON70 wrote: Hi, Suppose I have following dataset : mat <- matrix(rnorm(100), 50) Now

Re: [R] Calling library functions from outside R

enotypes/2008-07_phaseIII/hapmap_format/forward ", outRootDir="/humgen/cnp04/sandbox/data/snpTagging")' Thanks for the pointer on getopt - it's much nicer than my homebrew solution. -Jim On Jun 18, 2009, at 1:54 PM, Jim Nemesh wrote: I did look at ?Rscript. My question there

Re: [R] Calling library functions from outside R

and have a look at ?Rscript Also on Windows see Rscript.bat and #Rscript.bat in http://batchfiles.googlecode.com and on Linux see: http://dirk.eddelbuettel.com/code/littler.html On Thu, Jun 18, 2009 at 1:25 PM, Jim Nemesh wrote: I develop quite a bit of R code that I tend to distribute, or

[R] Calling library functions from outside R

ke each expression is evaluated separately. Is there a way to evaluate multiple expressions in the same environment to make the above work? If so, I could then wrap R in whatever language of choice I'd like, and only have to make a user install a library.