* nn = a scalar for the size of the vector to be generated or nn(1) = nrows, nn(2) = ncols for a matrix to be generated
* v = the degrees of freedom
Output
* rn = (nxm) vector of draws from the chi-squared law
DESCRIPTION
Generates random chi-squared deviates.
EXAMPLE
x=chis_rnd(18,2)// Creates a (18x1) vector of draws from the chi-square with 2 degrees of freedom distribution.x=chis_rnd([42],3)// Creates a (4x2) matrix of draws from the chi-square with 3 degrees of freedom distribution.