[R] Summing over an index of an array

From: Saurav Pathak <saurav_at_sas.upenn.edu>
Date: Tue, 19 Feb 2008 18:39:52 -0500


I cannot seem to figure out how to sum over an index of a array. For example, let A be a 3 dimensional array. I want to, say, find the sum over the first dimension. That is

        S_jk = Sum_i A_ijk

where now S is a 2-dim matrix. I dont want to use a loop.



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Received on Tue 19 Feb 2008 - 23:44:17 GMT

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