Factorial, tgamma & matrix building

Modeling
2

Stan currently doesn’t have a function for converting reals to ints, but you can write one pretty simply:

int real_to_int(real x) {
    int i = 1;
    while(i < x) {
        i += 1;
    }
    return i;
}

Note that this is a pretty basic implementation and will always round up:

real_to_int(25.0) = 25
real_to_int(25.1) = 26

So keep that in mind if you end up working with reals that have decimals

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