[R] Conditional Matrices

[Patrick Burns]

ifelse(mat1, mat2, NA)

should do what you want.

Patrick Burns
patrick at burns-stat.com
+44 (0)20 8525 0696
http://www.burns-stat.com
(home of S Poetry and "A Guide for the Unwilling S User")

ISAIAH SHALWITZ wrote:

>This seems like a simple problem but I can't figure it out:
>
>I have two identical DIMENSION matrices.  Both contain only binary values NOT identical between matrices.  What I want to do: If in cell (1,1) the value in the first matrix (x) equals 1, then I keep the value in cell (1,1) in the second matrix (y).  If in cell (1,1) the value in the first matrix (x) equals 0, then I change the value in cell (1,1) in the second matrix (y)to missing (NA).  Repeat for every pair of cells (coordinates of the paired cells always match).
>
>Please help.
>
>I
>
>______________________________________________
>R-help at stat.math.ethz.ch mailing list
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
>
>
>
>  
>