Elemental Intrinsic Function (Generic): Returns the gamma value of its argument.
result = GAMMA (x)
x
(Input) Must be of type real. It must not be zero or a negative number.
The result type and kind are the same as x.
The result has a value equal to a processor-dependent approximation to the gamma function of x,
GAMMA (1.0) has the approximate value 1.000.
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