binomial coefficients
[k]=bincoef(n,N)
* n = (mxp) matrix
* N = (nxp) matrix (same size than n) or scalar
* k = (mxp) matrix of binomial coefficents with
- k(i,j)=binomial(n(i,j),N(i,j)) or
- k(i,j)=binomial(n(i,j),N) if N is a scalar
k=bincoef(5,15)