try this:
matLis <- list(matrix(1:4, 2, 2), matrix(1:6, 3, 2),
matrix(2:1, 1, 2))
n <- max(sapply(matLis, nrow))
do.call(cbind, lapply(matLis, function (x)
rbind(x, matrix(, n-nrow(x), ncol(x)))))
I hope it helps.
Best,
Dimitris
On 1/6/2011 11:56 AM, emj83 wrote:
Hi,
I have several matrix in a list, for example:
e
[[1]]
[,1] [,2]
[1,] 1 3
[2,] 2 4
[[2]]
[,1] [,2]
[1,] 1 4
[2,] 2 5
[3,] 3 6
[[3]]
[,1] [,2]
[1,] 2 1
I would like to join them by column i.e.
[,1] [,2] [,3] [,4][,5] [,6]
[1,] 1 3 1 4 2 1
[2,] 2 4 2 5 NA NA
[3,] NA NA 3 6 NA NA
I have tried do.call(cbind,e) but I get this error message as the rows are
of different length-
Error in function (..., deparse.level = 1) :
number of rows of matrices must match (see arg 2)
Can anyone advise me please?
Thanks Emma
--
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center
Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
Fax: +31/(0)10/7043014
Web: http://www.erasmusmc.nl/biostatistiek/
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