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/* sys/hypot.c
*
* Copyright (C) 1996, 1997, 1998, 1999, 2000 Gerard Jungman, Brian Gough
*
* This program 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 of the License, or (at
* your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <config.h>
#include <math.h>
double gsl_hypot (const double x, const double y);
double gsl_hypot (const double x, const double y)
{
double xabs = fabs(x) ;
double yabs = fabs(y) ;
double min, max;
if (xabs < yabs) {
min = xabs ;
max = yabs ;
} else {
min = yabs ;
max = xabs ;
}
if (min == 0)
{
return max ;
}
{
double u = min / max ;
return max * sqrt (1 + u * u) ;
}
}
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