More accurate gamma and erf functions

• Subject: More accurate gamma and erf functions
• From: Raymond Toy
• Date: 28 Nov 2001 12:22:34 -0500

Here is a patch for more accurate gamma and erf functions.

The gamma routine is Lanczos algorithm so it's valid for complex
arguments too. http://winnie.fit.edu/~gabdo/gamma.txt is a nice
description of the algorithm used here.

The erf routine is a hand-modified version of an f2cl conversion of
the erf routine in TOMS 715.

I've checked these against the tables in A&S.  They match well.

Ray

Attached file: csimp2.patch

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