Hi,
Try this:
mat1<- as.matrix(read.table(text="
1 1 3 2 3 1 1 2 3 3 2
",sep="",header=FALSE))
res<-lapply(1:3,function(i) which(mat1==i))
names(res)<- c("a","c","b")
res
#$a
#[1] 1 2 6 7
#$c
#[1] 4 8 11
#$b
#[1] 3 5 9 10
A.K.
----- Original Message -----
From: eliza botto <eliza_bo...@hotmail.com>
To: "r-help@r-project.org" <r-help@r-project.org>
Cc:
Sent: Wednesday, March 6, 2013 6:26 AM
Subject: [R] combining column having same values
Dear useRs,
I have a matrix in the following form
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11]
1 1 3 2 3 1 1 2 3 3 2
and following is my desired output (combining the column headers, having same
values).
a<-1,2,6,7
b<-3,5,9,10
c<-4,8,11
Thanks in advance
Elisa
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and provide commented, minimal, self-contained, reproducible code.
