Try: mydata[substr(rownames(mydata),1,1)!="U",]
where mydata is a matrix or data.frame. ________________________________________ Daniel Moreira, MD "Sally" <sagol...@shaw.ca> Sent by: r-help-boun...@r-project.org 02/14/2009 11:48 PM Please respond to Sally <sagol...@shaw.ca> To <r-help@r-project.org> cc Sally <sagol...@shaw.ca> Subject [R] Delete row if first letter of row name is Hello! I am still a beginner. Can you tell me how to delete a row (from a matrix or data.frame) if the row name starts with U? See example below: U179971039 0.058663 0.087575 empty1 -0.1296 -0.09105 empty2 0.136259 0.398073 empty3 0.446041 -0.33997 Sally [[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. [[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.