LOG_GAMMA — Logarithm of the Gamma function#

LOG_GAMMA(X)#

LOG_GAMMA(X) computes the natural logarithm of the absolute value of the Gamma (Gamma) function.

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 = LOG_GAMMA(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