Vicky Landsman wrote on 3/16/2005 10:21 AM:
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]]
Hi Vicky,
This question is in the archives several times:
http://finzi.psych.upenn.edu/R/Rhelp02a/archive/10963.html
My answer last time was the following:
m <- list(matrix(rnorm(4),2,2),
matrix(rnorm(4),2,2),
matrix(rnorm(4),2,2))
mexpr <- paste("m[[", seq(along = m), "]]", collapse="+")
eval(parse(text = mexpr))HTH,
--sundar
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