trace_dot.hpp

Go to the documentation of this file.

#ifndef STAN_MATH_PRIM_FUN_TRACE_DOT_HPP
#define STAN_MATH_PRIM_FUN_TRACE_DOT_HPP
 
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/err.hpp>
#include <stan/math/prim/fun/Eigen.hpp>
 
namespace stan {
namespace math {
 
template <typename EigMat1, typename EigMat2,
          require_all_eigen_vt<std::is_arithmetic, EigMat1, EigMat2>* = nullptr>
inline auto trace_dot(EigMat1&& A, EigMat2&& B) {
  check_size_match("trace_dot", "A.cols()", A.cols(), "B.rows()", B.rows());
  check_size_match("trace_dot", "A.rows()", A.rows(), "B.cols()", B.cols());
  return make_holder(
      [](auto&& A_, auto&& B_) {
        return A_.cwiseProduct(B_.transpose()).sum();
      },
      std::forward<EigMat1>(A), std::forward<EigMat2>(B));
}
 
}  // namespace math
}  // namespace stan
 
#endif