FACTORIALM

Factorial function for matrices

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This is an extension of factorial.m in Matlab R13, for matrices. It is inspired by a post on CSSM.
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F = FACTORIALM(M) returns the factorial for all integers of the matrix M.
So,F(i) is the product of all integers from 1 to M(i), i.e. prod(1:M(i)).
F has the same size as M. NaNs and Infs in M will yield NaNs in F.

Example:
factorialm([1 6 0 ; NaN 4 -Inf])
will return : 1 720 1
NaN 24 NaN

Created for MatLab 13.
Last update: jan 23, 2007