Lahey/GNU Fortran

Next: , Previous: LOG10, Up: Intrinsic Procedures


8.154 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