Baptiste Coulmont <coulmont <at> yahoo.com> writes: > > I want to create a randomly generated 25*15 binary matrix knowing what the > colSums and rowSums of this matrix should be. > > colSums(a) > [1] 3 7 2 5 0 4 6 5 5 4 3 4 4 5... > rowSums(a) > [1] 8 6 6 6 6 6 5 5 5 5 4 4 4... >
This is a fairly challenging problem about which a lot has been written in the field of quantitative ecology. See ?commsimulator in the vegan package. Ben Bolker ______________________________________________ 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.