$LGamma

LGamma function

Note: Most Sirius $functions have been deprecated in favor of Object Oriented methods. There is currently no direct OO equivalent for the $LGamma function.

The $LGamma function returns the value:

log_{e 0}∫^∞ u^x-1 e^-u du

Syntax

%num = $LGamma(x)

Usage notes

• If x is not in the range 0 < x < 4.2913 * 10⁷³, an error message is printed and a 0 is returned.
• See the SIRFUNC EXEC parameter for an explanation of when this high-performance, high-precision version of the IBM mathematical function from the Sirius Mods is used, as opposed to the version of the $function in the Model 204 FUND or FUNDLE CSECT.