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 #ifndef STAN__MATH__FUNCTIONS__INVERSE_SOFTMAX_HPP

 #define STAN__MATH__FUNCTIONS__INVERSE_SOFTMAX_HPP


 #include <boost/math/tools/promotion.hpp>

 #include <stdexcept>

 #include <boost/throw_exception.hpp>


 namespace stan {

   namespace math {


     template <typename Vector>

     void inverse_softmax(const Vector& simplex, Vector& y) {

       using std::log;

       if(simplex.size() != y.size())

         BOOST_THROW_EXCEPTION(std::invalid_argument ("simplex.size() != y.size()"));

       for (size_t i = 0; i < simplex.size(); ++i)

         y[i] = log(simplex[i]);

     }


   }

 }


 #endif

stan::math::inverse_softmax
void inverse_softmax(const Vector &simplex, Vector &y)
Writes the inverse softmax of the simplex argument into the second argument.
Definition: inverse_softmax.hpp:34

stan::math::log
Eigen::Matrix< T, Rows, Cols > log(const Eigen::Matrix< T, Rows, Cols > &m)
Return the element-wise logarithm of the matrix or vector.
Definition: log.hpp:16

stan::agrad::log
fvar< T > log(const fvar< T > &x)
Definition: log.hpp:15