Fortran Wiki
gamma (Rev #2, changes)

Showing changes from revision #1 to #2: (追記) Added (追記ここまで) | ~~(削除) Removed (削除ここまで)~~ | ~~(削除) Chan (削除ここまで)~~(追記) ged (追記ここまで)

Description

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)!.


\\Gamma(x) = \\int_0^\\infty t^{x-1}{\\mathrm{e}}^{-t}\,円{\\mathrm{d}}t

Standard

~~(削除) Fortran 2008 and later (削除ここまで)~~(追記) Fortran 2008 (追記ここまで)(追記) and later (追記ここまで)

Class

~~(削除) Elemental function (削除ここまで)~~(追記) Elemental function (追記ここまで)

Syntax

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

Fortran Wiki gamma (Rev #2, changes)