normal_entropy.h

// Description: Entropy of normal distribution

#ifndef PASTELSYS_NORMAL_ENTROPY_H
#define PASTELSYS_NORMAL_ENTROPY_H

#include "pastel/sys/random/random_gaussian.h"

#include <cmath>

namespace Pastel
{

    //! Entropy of normal distribution.
    template <typename Real>
    Real entropy(const Normal_Distribution<Real>& distribution)
    {
        return distribution.n() * std::log(
                2 * constantPi<Real>() * constantNeper<Real>()
            ) + std::log(covariance(distribution).det());
    }

}

#endif