How to code factorial in stan?

Modeling
1

how to code factorial in stan?

2

gamma(x + 1);

3

factorial(8)
[1] 40320

it is right in the rstudio，but it’s wrong in file.stan，like：
SYNTAX ERROR, MESSAGE(S) FROM PARSER:
No matches for:

factorial(int)

Function factorial not found.

4

i get you ，thank you

5

SYNTAX ERROR, MESSAGE(S) FROM PARSER:
No matches for:

gamma(int)

Function gamma not found.

still wrong

6

I mean to say tgamma(x + 1);.

2 Likes
7

thank you