Hi,
Look at the R News 8/1 in the R Help Desk.
Alain
On 10-Mar-10 16:34, Carlos Petti wrote:
Dear list,
I have a list of three matrices :
i = list(matrix(1:4,2,2), matrix(3:6,2,2), matrix(9:12,2,2))
I would like to sum the matrices, as follows :
[,1] [,2]
[1,] 13 19
[2,] 16 22
I used this code :
k<- i[[1]]
for (j in (2:length(i))) {
k<- k + i[[j]]}
But, is it possible to sum without a loop ?
Thanks in advance,
Carlos
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Alain Guillet
Statistician and Computer Scientist
SMCS - IMMAQ - Université catholique de Louvain
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