On Jan 6, 2011, at 6:23 AM, Dimitris Rizopoulos wrote:
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)))))
It's good that you solved the OP's question so neatly, since the
alternate solution I was going to propose turns out to be for a
different problem. Had the problem been for binding by row and padding
with NA's, there is a ready-made function in the plyr package,
rbind.fill.matrix(). No cbind.fill or cbind.fill.matrix, yet. It looks
as though switching the roles of column and row in either of your
respective solutions could create a general solution though.
--
David.
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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