squared_distance.hpp

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#ifndef STAN__MATH__MATRIX__SQUARED_DISTANCE_HPP
#define STAN__MATH__MATRIX__SQUARED_DISTANCE_HPP

#include <stan/math/matrix/Eigen.hpp>
#include <stan/math/error_handling/matrix/check_vector.hpp>
#include <stan/math/error_handling/matrix/check_matching_sizes.hpp>

namespace stan {
  namespace math {
    
    template<int R1,int C1,int R2, int C2, typename T1, typename T2>
    inline typename boost::math::tools::promote_args<T1,T2>::type
    squared_distance(const Eigen::Matrix<T1, R1, C1>& v1, 
                     const Eigen::Matrix<T2, R2, C2>& v2) {
      stan::math::check_vector("squared_distance(%1%)",v1,"v1",(double*)0);
      stan::math::check_vector("squared_distance(%1%)",v2,"v2",(double*)0);
      stan::math::check_matching_sizes("squared_distance(%1%)",v1,"v1",
                                       v2,"v2",(double*)0);
      if (v1.rows() != v2.rows())
        return (v1.transpose()-v2).squaredNorm();
      else
        return (v1-v2).squaredNorm();
    }
  }
}
#endif