Re: [R] How to sum a list of matrices ?

2010-03-10 Thread David Winsemius
On Mar 10, 2010, at 10:34 AM, 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 > Reduce("+", i) [,1] [,2] [1,] 13 19 [2,]

Re: [R] How to sum a list of matrices ?

2010-03-10 Thread Alain Guillet
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

[R] How to sum a list of matrices ?

2010-03-10 Thread Carlos Petti
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 witho