exp.hpp

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#ifndef STAN__MATH__MATRIX__EXP_HPP
#define STAN__MATH__MATRIX__EXP_HPP

#include <stan/math/matrix/Eigen.hpp>
#include <boost/math/special_functions/fpclassify.hpp>
#include <limits>

namespace stan {
  namespace math {
    
    template<typename T, int Rows, int Cols>
    inline Eigen::Matrix<T,Rows,Cols> exp(const Eigen::Matrix<T,Rows,Cols>& m) {
      return m.array().exp().matrix();
    }
    
    //FIXME:
    //specialization not needed once Eigen fixes issue:
    //http://eigen.tuxfamily.org/bz/show_bug.cgi?id=859
    template<int Rows, int Cols>
    inline Eigen::Matrix<double,Rows,Cols> exp(const Eigen::Matrix<double,Rows,Cols>& m) {
      Eigen::Matrix<double,Rows,Cols> mat = m.array().exp().matrix();
      for (int i = 0, size_ = mat.size(); i < size_; i++)
        if (boost::math::isnan(m(i)))
          mat(i) = std::numeric_limits<double>::quiet_NaN();
      return mat;
    }
    
  }
}
#endif