On Dec 15, 2012, at 9:38 PM, Tjun Kiat Teo wrote: > Suppose I have a matrix of data > > A > > 1 2 3 > 4 5 6 > 7 8 9 > > > And I have a vector of indexes 2,1,3 > > For row 1 of matrix A I want the 2nd element 2 > For row 2 of matrix A I want the 1st element 4 > For row 3 of matrix A I want the 3rd element 9.
A[ cbind( 1:3, c(2,1,3) ) ] -- David Winsemius Alameda, CA, USA ______________________________________________ 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.
