Really Cool. THANK YOU Both works, only that New.mat is t is being transposed. So, I added a minor change:
New.mat <- matrix (mat [,colSums(mat==0) == 0], byrow = TRUE) -----Original Message----- From: Charles C. Berry [mailto:[EMAIL PROTECTED] Sent: Tuesday, January 15, 2008 12:34 PM To: My Coyne Cc: [EMAIL PROTECTED] Subject: Re: [R] Newbie Question -- Remove entire column in a matrix On Tue, 15 Jan 2008, My Coyne wrote: > > > 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 > > > > Many thanks in advance. > > > > --My Coyne > > > > > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > 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 ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
