linad99/bounder.cpp

Go to the documentation of this file.

/*
 * $Id$
 *
 * Author: David Fournier
 * Copyright (c) 2008-2012 Regents of the University of California
 */
#include "fvar.hpp"

  double bounder(double x,double min,double max, double scale)
  {
    double y=x/scale;
    double z;
    if (y<20.0)
    {
      z=exp(y)/(1.0+exp(y));
    }
    else
    {
      z=1.0/(1+exp(-y));
    }
    return min+(max-min)*z;
  }

  dvariable bounder(const prevariable&  x,double min,double max, double scale)
  {
    dvariable y=x/scale;
    dvariable z;
    if (y<20.0)
    {
      z=exp(y)/(1.0+exp(y));
    }
    else
    {
      z=1.0/(1+exp(-y));
    }
    return min+(max-min)*z;
  }