Restricting random matrices

[parisse]

The giac syntax for generating random matrices according to a probability distribution is
randmatrix(nrows,ncols,distribution,optional_distributions_arguments)
for example:
randmatrix(5,5,binomial,10,.3)
randmatrix(5,5,normald)
randmatrix(5,5,normald,1,2) (mu=1, sigma=2)
Some distributions available on giac are unfortunately not available on the Prime: exponentiald, studentd, fisherd, geometric, negbinomial, uniformd.