multiply.hpp

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#ifndef STAN__MATH__MATRIX__MULTIPLY_HPP
#define STAN__MATH__MATRIX__MULTIPLY_HPP

#include <boost/type_traits/is_arithmetic.hpp> 
#include <boost/utility/enable_if.hpp>
#include <stan/math/matrix/Eigen.hpp>
#include <stan/math/error_handling/matrix/check_matching_sizes.hpp>
#include <stan/math/error_handling/matrix/check_multiplicable.hpp>

namespace stan {
  namespace math {

    template <int R, int C, typename T>
    inline
    typename boost::enable_if_c<boost::is_arithmetic<T>::value, 
                                Eigen::Matrix<double, R, C> >::type
    multiply(const Eigen::Matrix<double, R, C>& m,
             T c) {
      return c * m;
    }

    // FIXME:  apply above pattern everywhere below to remove
    //         extra defs, etc.

    template <int R, int C, typename T>
    inline
    typename boost::enable_if_c<boost::is_arithmetic<T>::value, 
                                Eigen::Matrix<double, R, C> >::type
    multiply(T c,
             const Eigen::Matrix<double,R,C>& m) {
         return c * m;
    }

    template<int R1,int C1,int R2,int C2>
    inline Eigen::Matrix<double,R1,C2> multiply(const Eigen::Matrix<double,R1,C1>& m1,
                                                const Eigen::Matrix<double,R2,C2>& m2) {
      
      stan::math::check_multiplicable("multiply(%1%)",m1,"m1",
                                      m2,"m2",(double*)0);
      return m1*m2;
    }

    template<int C1,int R2>
    inline double multiply(const Eigen::Matrix<double,1,C1>& rv,
                           const Eigen::Matrix<double,R2,1>& v) {
      stan::math::check_matching_sizes("multiply(%1%)",rv,"rv",
                                       v,"v",(double*)0);
      if (rv.size() != v.size()) 
        throw std::domain_error("rv.size() != v.size()");
      return rv.dot(v);
    }

  }
}
#endif