subtract.hpp

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#ifndef __STAN__MATH__MATRIX__SUBTRACT_HPP__
#define __STAN__MATH__MATRIX__SUBTRACT_HPP__

#include <boost/math/tools/promotion.hpp>
#include <stan/math/matrix/Eigen.hpp>
#include <stan/math/matrix/validate_matching_dims.hpp>

namespace stan {
  namespace math {

    template <typename T1, typename T2, int R, int C>
    inline
    Eigen::Matrix<typename boost::math::tools::promote_args<T1,T2>::type, R, C>
    subtract(const Eigen::Matrix<T1,R,C>& m1,
             const Eigen::Matrix<T2,R,C>& m2) {
      stan::math::validate_matching_dims(m1,m2,"subtract");
      Eigen::Matrix<typename boost::math::tools::promote_args<T1,T2>::type, R, C>
        result(m1.rows(), m1.cols());
      for (int i = 0; i < result.size(); ++i)
        result(i) = m1(i) - m2(i);
      return result;
    }

    template <typename T1, typename T2, int R, int C>
    inline
    Eigen::Matrix<typename boost::math::tools::promote_args<T1,T2>::type, R, C>
    subtract(const T1& c,
             const Eigen::Matrix<T2,R,C>& m) {
      Eigen::Matrix<typename boost::math::tools::promote_args<T1,T2>::type, R, C>
        result(m.rows(),m.cols());
      for (int i = 0; i < m.size(); ++i)
        result(i) = c - m(i);
      return result;
    }

    template <typename T1, typename T2, int R, int C>
    inline
    Eigen::Matrix<typename boost::math::tools::promote_args<T1,T2>::type, R, C>
    subtract(const Eigen::Matrix<T1,R,C>& m,
             const T2& c) {
      Eigen::Matrix<typename boost::math::tools::promote_args<T1,T2>::type, R, C>
        result(m.rows(),m.cols());
      for (int i = 0; i < m.size(); ++i)
        result(i) = m(i) - c;
      return result;
    }

  }
}
#endif