erf.h

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//%Header {
/*****************************************************************************
*
* File: src/MushRuby/missing/erf.c (ruby)
*
* This file has been taken the ruby distribution and may have been modified.
* For more information on the original see http://www.ruby-lang.org/.
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* This file may contain original work and modifications by Andy Southgate.
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* This software carries NO WARRANTY of any kind from Andy Southgate or
* Mushware Limited.
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****************************************************************************/

double erf(double x);

double erfc(double x);

static double p_gamma(double a, double x, double loggamma_a);

static double q_gamma(double a, double x, double loggamma_a);