[R] Computing sums of the columns of an array

From: Martin C. Martin <martin_at_metahuman.org>
Date: Sat 06 Aug 2005 - 02:16:41 EST


I have a 5x731 array A, and I want to compute the sums of the columns. Currently I do:

apply(A, 2, sum)

But it turns out, this is slow: 70% of my CPU time is spent here, even though there are many complicated steps in my computation.

Is there a faster way?


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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sat Aug 06 02:22:11 2005

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