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squared_distance.hpp
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1 #ifndef STAN_MATH_PRIM_MAT_FUN_SQUARED_DISTANCE_HPP
2 #define STAN_MATH_PRIM_MAT_FUN_SQUARED_DISTANCE_HPP
3
4 #include <stan/math/prim/mat/fun/Eigen.hpp>
5 #include <stan/math/prim/mat/err/check_vector.hpp>
6 #include <stan/math/prim/mat/err/check_matching_sizes.hpp>
7
8 namespace stan {
9 namespace math {
10
20 template<int R1, int C1, int R2, int C2, typename T1, typename T2>
21 inline typename boost::math::tools::promote_args<T1, T2>::type
22 squared_distance(const Eigen::Matrix<T1, R1, C1>& v1,
23 const Eigen::Matrix<T2, R2, C2>& v2) {
24 stan::math::check_vector("squared_distance", "v1", v1);
25 stan::math::check_vector("squared_distance", "v2", v2);
26 stan::math::check_matching_sizes("squared_distance",
27 "v1", v1,
28 "v2", v2);
29 if (v1.rows() != v2.rows())
30 return (v1.transpose()-v2).squaredNorm();
31 else
32 return (v1-v2).squaredNorm();
33 }
34 }
35 }
36 #endif
stan::math::check_vector
bool check_vector(const char *function, const char *name, const Eigen::Matrix< T, R, C > &x)
Return true if the matrix is either a row vector or column vector.
Definition: check_vector.hpp:34
stan::math::squared_distance
boost::math::tools::promote_args< T1, T2 >::type squared_distance(const Eigen::Matrix< T1, R1, C1 > &v1, const Eigen::Matrix< T2, R2, C2 > &v2)
Returns the squared distance between the specified vectors.
Definition: squared_distance.hpp:22
check_matching_sizes.hpp
stan::math::check_matching_sizes
bool check_matching_sizes(const char *function, const char *name1, const T_y1 &y1, const char *name2, const T_y2 &y2)
Return true if two structures at the same size.
Definition: check_matching_sizes.hpp:29
Eigen.hpp
check_vector.hpp

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