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/* sys/hypot.c
*
* Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Gerard Jungman, Brian Gough, Patrick Alken
*
* 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 3 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>
#include <gsl/gsl_math.h>
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) ;
}
}
double
gsl_hypot3(const double x, const double y, const double z)
{
double xabs = fabs(x);
double yabs = fabs(y);
double zabs = fabs(z);
double w = GSL_MAX(xabs, GSL_MAX(yabs, zabs));
if (w == 0.0)
{
return (0.0);
}
else
{
double r = w * sqrt((xabs / w) * (xabs / w) +
(yabs / w) * (yabs / w) +
(zabs / w) * (zabs / w));
return r;
}
}
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