try this: mat <- sample(0:1, 49, TRUE) dim(mat) <- c(7, 7) mat[c(1,4), ] <- 0
ind <- rowSums(mat == 0) != ncol(mat) mat[ind, ] I hope it helps. Best, Dimitris ---- Dimitris Rizopoulos Biostatistical Centre School of Public Health Catholic University of Leuven Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/(0)16/336899 Fax: +32/(0)16/337015 Web: http://med.kuleuven.be/biostat/ http://www.student.kuleuven.be/~m0390867/dimitris.htm ----- Original Message ----- From: "Patrick Zimmermann" <[EMAIL PROTECTED]> To: "r-help" <[EMAIL PROTECTED]> Sent: Tuesday, April 22, 2008 11:52 AM Subject: [R] removing zero rows from matrix/table > Dear R-community, > I have matrices/tables of different sizes which may contain rows > with > only zeros. Now I would like to delete these zero lines or create > new > matrices composed only of the non-zero lines. Columns only > containing > zeros I want to preserve. > Here an example: > > [,1] [,2] [,3] [,4] [,5] [,6] [,7] > [1,] 1 0 1 1 0 0 0 > [2,] 0 0 0 0 0 0 0 > [3,] 1 0 0 0 0 0 0 > [4,] 1 0 1 1 1 1 1 > [5,] 1 0 1 0 1 0 1 > [6,] 0 0 1 1 1 1 1 > [7,] 0 0 0 0 0 0 0 > > Rows 2 and 7 shall be deleted, but column 2 shall be maintained. > I believe this should be a simple operation with basic commands, but > have no idea how to manage it. > Looking forward do any help, > Patrick > > ______________________________________________ > 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. > Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm ______________________________________________ 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.
