8.155 LOG_GAMMA — Logarithm of the Gamma function
- Description:
-
LOG_GAMMA(X) computes the natural logarithm of the absolute value of the Gamma (\Gamma) function.
- Standard:
- Fortran 2008 and later
- Class:
- Elemental function
- Syntax:
-
X = LOG_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:
-
program test_log_gamma
real :: x = 1.0
x = lgamma(x) ! returns 0.0
end program test_log_gamma
- Specific names:
-
| Name |
Argument |
Return type |
Standard |
LGAMMA(X) |
REAL(4) X |
REAL(4) |
GNU Extension |
ALGAMA(X) |
REAL(4) X |
REAL(4) |
GNU Extension |
DLGAMA(X) |
REAL(8) X |
REAL(8) |
GNU Extension |
- See also:
- Gamma function: GAMMA