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... . . Baptiste Coulmont coulmont at yahoo.com --------