Manual Reference Pages - log_gamma (3)

log_gamma(3f) - [FORTRAN:INTRINSIC:MATHEMATICS] Logarithm of the Gamma function

x = log_gamma(x)

log_gamma(x) computes the natural logarithm of the absolute value of the [[Gamma function]].

X Shall be of type REAL and neither zero nor a negative integer.

The return value is of type REAL of the same kind as X.

Sample program:

   program demo_log_gamma
   implicit none
     real :: x = 1.0
     x = log_gamma(x) ! returns 0.0
   end program demo_log_gamma

[[Fortran 2008]] and later

[[Elemental function]]