[R] Matrix column flip when recycled

[arun]

library(plyr)
M.1[,1:2]<-do.call(rbind,alply(replicate(3,M.2),3,function(x) x))
#or

M.1[,1:2]<-matrix(aperm(replicate(3,M.2),c(1,3,2)),ncol=2)

A.K.




----- Original Message -----
From: Thiem Alrik <thiem at sipo.gess.ethz.ch>
To: "mailman, r-help" <r-help at r-project.org>
Cc: 
Sent: Sunday, July 14, 2013 9:48 AM
Subject: [R] Matrix column flip when recycled

Dear list,

I have a matrix M.1 (30x2) into which I would like to paste another matrix M.2 (10x2) three times. However, the columns get flipped in every odd-numbered recycle run. How can I avoid this behavior?

M.1 <- matrix(numeric(30*2), ncol = 2)
M.2 <- t(combn(1:5, 2))
M.1[, 1:2] <- M.2

Many thanks for help,

Alrik

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