Fortran Wiki
gamma (changes)

Showing changes from revision #3 to #4: (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 (~~(削除) \\Gamma (削除ここまで)~~(追記) $\Gamma$ (追記ここまで)) of x. For positive, integer values of x the Gamma function simplifies to the factorial function ~~(削除) \\Gamma(x)=(x-1)! (削除ここまで)~~(追記) $\Gamma(x)=(x-1)!$ (追記ここまで).

~~(削除) \\Gamma(x) = \\int_0^\\infty t^{x-1}{\\mathrm{e}}^{-t}\,円{\\mathrm{d}}t (削除ここまで)~~(追記)

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

(追記ここまで)

Standard

Fortran 2008 and later

Class

Elemental function

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 (changes)