Message-ID: <39B6DDB9048D0F4DAD42CB26AAFF0AFA64EB64@usctmx1106.Merck.com>
Date: 2005-08-05T16:22:29Z
From: Liaw, Andy
Subject: Computing sums of the columns of an array
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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