[R] Vector comparison to matrix

From: Todd Remund <tkremund98_at_hotmail.com>
Date: Mon 15 Aug 2005 - 15:12:42 EST


I am looking for a fast way to count the number of rows in a matrix are identical to a pattern vector. For example, if I am interested in counting the number of row vectors in a matrix that are identical to (1,2,3) what would I do? I have tried the identical statement in a loop but this is far too slow. I have a very large matrix and need to avoid loops at all costs. Thanks for any help.
Todd Remund



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