Sha256: 302b760fd29972aa629acfee3ba78e2c511c0cfa614c3e9abdd5666a186558e4

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Size: 1.67 KB

Versions: 14

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Stored size: 1.67 KB

Contents

/* sys/gsl_compare.c
 * 
 * Copyright (C) 2002 Gert Van den Eynde
 * 
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 * 
 * Based on fcmp 1.2.2 Copyright (c) 1998-2000 Theodore C. Belding
 * University of Michigan Center for the Study of Complex Systems
 * Ted.Belding@umich.edu
 *
 */

#include "rb_gsl_config.h"

#ifndef GSL_1_3_LATER

#include <config.h>
#include <gsl/gsl_sys.h>
#include <math.h>

int gsl_fcmp(const double x1, const double x2, const double epsilon)
{
  int exponent;
  double delta, difference;

  /* Find exponent of largest absolute value */

  {
    double max = (fabs (x1) > fabs (x2)) ? x1 : x2;

    frexp (max, &exponent);
  }

  /* Form a neighborhood of size  2 * delta */

  delta = ldexp (epsilon, exponent);

  difference = x1 - x2;

  if (difference > delta)       /* x1 > x2 */
    {
      return 1;
    }
  else if (difference < -delta) /* x1 < x2 */
    {
      return -1;
    }
  else                          /* -delta <= difference <= delta */
    {
      return 0;                 /* x1 ~=~ x2 */
    }
}

#endif

Version data entries

14 entries across 14 versions & 5 rubygems

Version Path
gsl-nmatrix-1.15.3.2 ext/fcmp.c
romanbsd-gsl-1.11.2.2 ext/fcmp.c
gsl-nmatrix-1.15.3.1 ext/fcmp.c
rb-gsl-1.16.0 ext/fcmp.c
rb-gsl-1.15.3.2 ext/fcmp.c
rb-gsl-1.15.3.1 ext/fcmp.c
blackwinter-gsl-1.15.3.2 ext/fcmp.c
gsl-nmatrix-1.15.3.0 ext/fcmp.c
gsl-1.15.3 ext/fcmp.c
gsl-1.14.7 ext/fcmp.c
gsl-1.14.6 ext/fcmp.c
gsl-1.14.5 ext/fcmp.c
gsl-1.12.109 ext/fcmp.c
gsl-1.12.108 ext/fcmp.c