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I have two matrices (see example below) and I want the differences for the matching row numbers, but the row numbers are not identical in the two matrices. There are probably many ways to do this. Anyone know of any easy way to do this? I could loop over them, but you know what they say about for loops... Thanks, Roger > out.r[1:5, 1:3] 1 2 3 1100 -0.0992 -0.0802 -0.0653 1200 -0.1242