[R] applying wilcox.test to every combination of rows in a matrix (pairwise)
Ulrik Stervbo
ulrik.stervbo at gmail.com
Wed Dec 9 14:17:29 CET 2015
Could you use expand.grid and loop over each returned row?
Best,
Ulrik
On Wed, 9 Dec 2015 at 13:55 debra ragland via R-help <r-help at r-project.org>
wrote:
> Hello All,
>
> I have written the following loop which will apply/split the same vector
> of numbers (pc1.eigv) to each (logical) row of a matrix and run a
> wilcox.test on those values that line up with TRUE and those that line up
> with FALSE. It works fine. However, I am now interested in using the same
> vector and (logical)matrix run the wilcox.test only this time I would like
> information about pairs of rows (not just single rows as it already does).
>
> The loop:
> n.iteration=dim(as.matrix(p))[1]
> n.test= rep(NA, n.iteration )
> for( i in 1:n.iteration ){ ## i=1
> i_spl<-split(pc1.eigv, p[i,])
> if( sum(p[i,])==15 | sum(p[i,])==0) { n.test[i]=NA }
> if( sum(p[i,])!=15 & sum(p[i,])!=0) {
> testout=wilcox.test(i_spl$'TRUE', i_spl$'FALSE')
> n.test[i]=testout$p.value }
> }
>
>
> some sample data
> p<-matrix(c(rep(c(F,T,F),3), rep(c(T,F,T),3), rep(c(T,T,F),3),
> rep(c(F,F,T),3)))
>
> pc1.eigv<-runif(4, 1.0, 2.0)
>
> After some searching I thought that perhaps the combn function would help
> me (i.e. combn(p)) for the same loop but I get an error.
>
> Can anyone help with this?
>
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