mylist <- list(matrix(1:6, 2), matrix(7:12, 2), matrix(13:18, 2))
do.call("+", mylist)
Error in do.call("+", mylist) : operator needs one or two arguments
Best, Dimitris
----- Original Message ----- From: "Adaikalavan Ramasamy" <[EMAIL PROTECTED]>
To: "Vicky Landsman" <[EMAIL PROTECTED]>
Cc: "R-help" <[email protected]>
Sent: Wednesday, March 16, 2005 5:32 PM
Subject: Re: [R] Summing up matrices in a list
mylist <- list( matrix(1:6, nc=3), matrix(7:12, nc=3) ) do.call("+", mylist) [,1] [,2] [,3] [1,] 8 12 16 [2,] 10 14 18
Regards, Adai
On Wed, 2005-03-16 at 18:21 +0200, Vicky Landsman wrote:Dear all, I think that my question is very simple but I failed to solve it. I have a list which elements are matrices like this:
>mylist [[1]] [,1] [,2] [,3] [1,] 1 3 5 [2,] 2 4 6
[[2]] [,1] [,2] [,3] [1,] 7 9 11 [2,] 8 10 12
I'd like to create a matrix M<-mylist[[1]]+mylist[[2]] [,1] [,2] [,3] [1,] 8 12 16 [2,] 10 14 18
Is there a way to create M without looping? Thanks a lot, Vicky Landsman. [[alternative HTML version deleted]]
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