[R] randomly generated binary matrix (with conditions)

[Ben Bolker]

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