Assuming that you want odd-numbered rows/cols, the seq() function is handy, as in:
mat <- matrix(1:(20*30), nr = 20) mat1 <- mat[seq(1, 19, by = 2), seq(1, 29, by = 2)] Peter Ehlers zhijie zhang wrote: > Dear friends, > I have a (20*30) matrix,and want to get a subset of it like the following: > The original matrix: rows:1,2,3,....20; columns:1,2,3,....30 > I want to get my subset of The original matrix and delete others: > rows:1,3,5,7,...19; columns:1,3,5.....29 > > > -- > Kind Regards,Zhi Jie,Zhang ,PHDDepartment of EpidemiologySchool of Public > HealthFudan UniversityTel:86-21-54237149 > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html