[R] Removing columns that are all NA from a matrix
Chuck Cleland
ccleland at optonline.net
Thu Feb 14 14:09:13 CET 2008
On 2/14/2008 7:59 AM, Martin Waller wrote:
> Hi,
>
> I guess this might be a FAQ or something, and there's probably a nice
> simple way to do it, but I can't think of it:
>
> Given a matrix, I want to remove columns that are _entirely_ filled with
> NAs (partial NAs are fine).
>
> How please?
mymat[,which(colMeans(is.na(mymat)) < 1)]
> Thanks,
>
> Martin
>
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--
Chuck Cleland, Ph.D.
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