vcumdlog.cpp

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#include <fvar.hpp>

dvariable cumd_logistic(const prevariable& x)
{
  if (value(x)>=0.0)
  {
    return 1.0/(1.0+exp(-x));
  }
  else
  {
    dvariable y=exp(x);
    return y/(1.0+y);
  }
}

dvariable inv_cumd_logistic(const prevariable& x)
{
  return log(x/(1.0-x));
}