Binomial Random Number Generator

Generates Binomial random numbers B(N,p). Works efficiently for large trial sizes, N.

The builtin binornd takes N operations to generate a single deviate, which is impossibly slow when N is large. The current code, modelled on the algorithm in Numerical Recipes, works efficiently for all N. Takes as input two vectors of length L, one with the N's and the second with the p's.