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gamma (Rev #3, changes)

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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

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 (Rev #3, changes)