[EMAIL PROTECTED] napsal dne 03.09.2008 15:54:08: > try this: > > x <- c(3,3,3,3,0,0,0,0,5,5,5,5,8,8,8,8) > x <- matrix(x, nrow=4) > > which(colSums(x == 0) == nrow(x))
Isn't this the same? which(colSums(x)==0) Regards Petr > > I hope it helps. > > Best, > Dimitris > > > Muhammad Azam wrote: > > Dear R community > > I have a problem regarding which of the column in a matrix contains all of > zero elements. e.g. > > x=c(3,3,3,3,0,0,0,0,5,5,5,5,8,8,8,8); x=matrix(x, nrow=4) > > the output is > > > >> x > >> > > [,1] [,2] [,3] [,4] > > [1,] 3 0 5 8 > > [2,] 3 0 5 8 > > [3,] 3 0 5 8 > > [4,] 3 0 5 8 > > In this case the required column is second so the result should be "2". How > can i get it? > > > > > > best regards > > > > Muhammad Azam > > > > > > > > > > [[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. > > > > > > > -- > Dimitris Rizopoulos > Assistant Professor > Department of Biostatistics > Erasmus University Medical Center > > Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands > Tel: +31/(0)10/7043399 > Fax: +31/(0)10/7044657 > > ______________________________________________ > 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. ______________________________________________ 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.
