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dot_product.hpp
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1 #ifndef STAN_MATH_PRIM_MAT_FUN_DOT_PRODUCT_HPP
2 #define STAN_MATH_PRIM_MAT_FUN_DOT_PRODUCT_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/arr/err/check_matching_sizes.hpp>
7 #include <vector>
8
9 namespace stan {
10 namespace math {
11
21 template<int R1, int C1, int R2, int C2>
22 inline double dot_product(const Eigen::Matrix<double, R1, C1>& v1,
23 const Eigen::Matrix<double, R2, C2>& v2) {
24 check_vector("dot_product", "v1", v1);
25 check_vector("dot_product", "v2", v2);
26 check_matching_sizes("dot_product", "v1", v1, "v2", v2);
27 return v1.dot(v2);
28 }
35 inline double dot_product(const double* v1, const double* v2,
36 size_t length) {
37 double result = 0;
38 for (size_t i = 0; i < length; i++)
39 result += v1[i] * v2[i];
40 return result;
41 }
48 inline double dot_product(const std::vector<double>& v1,
49 const std::vector<double>& v2) {
50 check_matching_sizes("dot_product", "v1", v1, "v2", v2);
51 return dot_product(&v1[0], &v2[0], v1.size());
52 }
53
54 }
55 }
56 #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
Definition: log_sum_exp.hpp:8
stan::length
size_t length(const std::vector< T > &x)
Definition: length.hpp:10
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
stan::math::dot_product
fvar< T > dot_product(const Eigen::Matrix< fvar< T >, R1, C1 > &v1, const Eigen::Matrix< fvar< T >, R2, C2 > &v2)
Definition: dot_product.hpp:18
Eigen.hpp
check_vector.hpp

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