$LGamma

LGamma function

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:

hp0 font=chapn.

• &numsp.&'sub(&infin.)
  log&'sub(e) &'sub(0)&int. u&'sup( x-1) e&'sup( - u) du

ehp0.

Syntax

%num = $LGamma(x)

If x is not in the range 0 < x < 4.2913 * 10&'sup(73), 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.