HI Eliza,
You could try this:
set.seed(15)
mat1<-matrix(sample(1:2000,1776,replace=TRUE),ncol=444)
colnames(mat1)<-paste("Col",1:444,sep="")
res<-lapply(seq_len(ncol(mat1)),function(i) mat1[,seq(i,444,37)])
#If you want only this from 1:37, then
res1<-lapply(1:37,function(i) mat1[,seq(i,444,37)])
A.K.
----- Original Message -----
From: eliza botto <eliza_bo...@hotmail.com>
To: "r-help@r-project.org" <r-help@r-project.org>
Cc:
Sent: Tuesday, December 25, 2012 12:03 AM
Subject: [R] for loop not working
dear R family,i have a matrix of 444 columns. what i want to do is the
following.
1. starting from column 1 i want to select every 37th column on the way. more
precisely i want to select column 1, 38,75,112,149 and so on.
2.starting from column 2, i again want to select every 37th column. which means
2,39,76,113,150 and so on.
similarly starting from 3 till 37th column.
i have tried following loop command which is not working.can anyone plz see
whats wrong in that?
>for (i in 1:37)
>{
>a<-e[,e[i]:444]
>}
> lapply(seq_len(1),
function(i) {
>a[,c(TRUE, rep(FALSE,1))]
>})
extremly sorry for bothering you once again..
eliza
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