[R] colSums in C

Thomas Lumley tlumley at u.washington.edu
Wed Dec 19 01:35:44 CET 2001

On Tue, 18 Dec 2001, David Brahm wrote:
> Is there a macro that is equivalent to (as fast as) isnan() when it exists?
> ISNAN is definitely slower.

You should be able to test for NA or NaN pretty efficiently with
This doesn't work on systems without IEEE754 arithmetic, but more
importantly some compilers don't realise that it's a real test and
optimise it away.


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