FACT function
Factorial function. FACT(n) returns the factorial of n. The factorial of a number n, n!, is equal to 1*2*3*…*n.
$$ n! = \prod_{k=1}^n k $$
$$ n! = \prod_{k=1}^n k $$
If the argument n is not an integer, it is truncated.
The argument n cannot be negative.
If n is larger than 170, the function overflows and returns an error (consider using the GammaLn function for calculations).
The argument n can be a real number or a matrix. When it is a matrix, the function returns a matrix with the same dimensions and with the FACT function applied to all elements.
Example
FACT(5) equals 120 (=1*2*3*4*5)
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