On Tue, 15 Jan 2008, My Coyne wrote:
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> I'm ordering "The R Book" and hope to learn a lot more about R. In a
> meantime, I have a matrix of digits and I would like to look for a column
> that contains zeroes and remove the entire column from the matrix. I can
> write a piece of R code to do that (and it works); however, I think the
> R-experts have more tricks to do such a 'simple' thing.
Is one of these what you want?
new.mat <- mat[ , colSums( mat==0 ) == 0 ]
new.mat <- mat[ , colSums( mat==0 ) < nrow(mat) ]
HTH,
Chuck
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> Many thanks in advance.
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> --My Coyne
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>
Charles C. Berry (858) 534-2098
Dept of Family/Preventive Medicine
E mailto:[EMAIL PROTECTED] UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901
______________________________________________
[email protected] mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
