Need code for Inverse Error Function

Question

Does anyone know where I could find code for the \"Inverse Error Function?\" Freepascal/Delphi would be preferable but C/C++ would be fine too.

The TMath/DMath library d

Answer 1

The math is pretty complex, but there's a decent approximation described here (warning: PDF) that includes Maple code. Unfortunately it involves a "solve for x" step that might make it useless to you.