Re: [R] Computing sums of the columns of an array

From: Liaw, Andy <andy_liaw_at_merck.com>
Date: Sat 06 Aug 2005 - 02:22:29 EST


See ?colSums.

Andy

> From: Martin C. Martin
>
> Hi,
>
> 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?
>
> Thanks,
> Martin
>
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>



R-help@stat.math.ethz.ch mailing list
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 02:27:05 2005

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