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lgamma.c
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C/C++ Source or Header
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1996-03-03
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/*
Copyright (C) 1996 John W. Eaton
This file is part of Octave.
Octave is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
Octave is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifndef HAVE_LGAMMA
#include "f77-fcn.h"
/* If the system doesn't have lgamma, assume that it doesn't have
signgam either */
int signgam;
extern int F77_FCN (dlgams, DLGAMS) (const double*, double*, double*);
double
lgamma (double x)
{
double result;
double sgngam;
F77_FCN (dlgams, DLGAMS) (&x, &result, &sgngam);
signgam = (int) sgngam;
return result;
}
#endif
/*
;;; Local Variables: ***
;;; mode: C ***
;;; End: ***
*/