#include <config.h>
#include <functions/Exp.h>
#include <sarray/SArray.h>

#include <cmath>

using std::vector;
using std::exp;
using std::log;

Exp::Exp ()
  : InverseLinkFunc ("exp", "log")
{
}

double
Exp::eval (vector <SArray const *> const &args) const
{
  return exp (*args[0]->value());
}

double Exp::link(double mu) const
{
  return log(mu);
}

double Exp::gradLink(double mu) const
{
  return 1/mu;
}