On Tue, Jun 12, 2012 at 11:44:51AM -0500, Michael wrote:
> Hi all,
>
> Lets say I have a matrix A which is m x n.
>
> I also have a mask matrix MASK which is m x n with values in T/F, where T
> values make a sub-matrix in regutangular shape...
>
> I applied B=A[MASK] and it didn't work as expected...
Hi.
Try the following.
A <- matrix(1:16, nrow=4, ncol=4)
B <- matrix(FALSE, nrow=4, ncol=4)
B[2:3, 2:3] <- TRUE
A[rowSums(B) != 0, colSums(B) != 0]
[,1] [,2]
[1,] 6 10
[2,] 7 11
Hope this helps.
Petr Savicky.
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