Message-ID: <15190.54865.919806.670532@gargle.gargle.HOWL>
Date: 2001-07-19T12:45:05Z
From: a296180 at mica.fmr.com (David Kane
Subject: Summary of colSums
Thanks to Andy Liaw, Douglas Bates and Marcel Wolters for spending time on my
problem. In summary, there does not seem to be a built in colSums in R as there
is in S+ 6.0. However, Doug Bates was kind enough to send me a simple math
utilities package that has a version of colSums in C. The package installed
without a hitch and produced similar performance to the S+ colSums function (in
my simple tests). Both Andy Liaw and Marcel Wolters pointed out that the built
in matrix operators (like %*%) are likely to be faster than apply, especially
if one has compiled R with the Atlas library (which I have not yet done).
Thanks again to all,
Dave Kane
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