[R] Conditional Matrices

From: ISAIAH SHALWITZ <shalwitz.1_at_osu.edu>
Date: Tue 16 Aug 2005 - 13:00:35 EST


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



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