Manual Reference Pages - gamma (3)
NAME
gamma(3f) - [FORTRAN:INTRINSIC:MATHEMATICS] Gamma function
DESCRIPTION
gamma(x) computes Gamma of X. For positive, integer values of X the Gamma function simplifies to the factorial function Gamma(x)=(x-1)!.$$ \Gamma(x) = \int_0**\infty t**{x-1}{\mathrm{e}}**{-t}\,{\mathrm{d}}t $$
SYNTAX
x = gamma(x)
ARGUMENTS
X Shall be of type REAL and neither zero nor a negative integer.
RETURN VALUE
The return value is of type REAL of the same kind as X.
EXAMPLE
Sample program:
program demo_gamma implicit none real :: x = 1.0 x = gamma(x) ! returns 1.0 end program demo_gamma
STANDARD
[[Fortran 2008]] and later
CLASS
[[Elemental function]]
SEE ALSO
Logarithm of the Gamma function: [[log_gamma(3)
| gamma (3) | March 11, 2021 |
