Multinomial probability density function

`Y = mnpdf(X,PROB)`

`Y = mnpdf(X,PROB)`

returns the pdf for the
multinomial distribution with probabilities `PROB`

,
evaluated at each row of `X`

. `X`

and `PROB`

are *m*-by-*k* matrices
or 1-by-*k* vectors, where *k* is
the number of multinomial bins or categories. Each row of `PROB`

must
sum to one, and the sample sizes for each observation (rows of `X`

)
are given by the row sums `sum(X,2)`

. `Y`

is
an *m*-by-1 vector, and `mnpdf`

computes
each row of `Y`

using the corresponding rows of the
inputs, or replicates them if needed.

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