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
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 ______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Only vectors recycle. If you don't want the behaviour if the matrix to
reflect that of the underlying vector then don't use recycling. Instead use
indexing.
M.1 <- M.2[rep(1:5,3),]
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Thiem Alrik <thiem at sipo.gess.ethz.ch> wrote:
>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
>
>______________________________________________
>R-help at r-project.org mailing list
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.