GAMMA — Gamma function¶

GAMMA(X)¶

GAMMA(X) computes Gamma (Gamma) of X. For positive, integer values of X the Gamma function simplifies to the factorial function Gamma(x)=(x-1)!.

Parameters: X – Shall be of type REAL and neither zero nor a negative integer.
Returns: The return value is of type REAL of the same kind as X.

Standard:: Fortran 2008 and later
Class:: Elemental function

Syntax:

X = GAMMA(X)

Example:

program test_gamma
  real :: x = 1.0
  x = gamma(x) ! returns 1.0
end program test_gamma

Specific names:

Name	Argument	Return type	Standard
`DGAMMA(X)`	`REAL(8) X`	`REAL(8)`	GNU extension

See also:

Logarithm of the Gamma function: LOG_GAMMA