Stan Math Library  2.15.0
reverse mode automatic differentiation
mdivide_right_tri.hpp
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1 #ifndef STAN_MATH_PRIM_MAT_FUN_MDIVIDE_RIGHT_TRI_HPP
2 #define STAN_MATH_PRIM_MAT_FUN_MDIVIDE_RIGHT_TRI_HPP
3 
10 #include <boost/math/tools/promotion.hpp>
11 
12 namespace stan {
13  namespace math {
14 
24  template <int TriView, typename T1, typename T2,
25  int R1, int C1, int R2, int C2>
26  inline
27  Eigen::Matrix<typename boost::math::tools::promote_args<T1, T2>::type,
28  R1, C2>
29  mdivide_right_tri(const Eigen::Matrix<T1, R1, C1> &b,
30  const Eigen::Matrix<T2, R2, C2> &A) {
31  check_square("mdivide_right_tri", "A", A);
32  check_multiplicable("mdivide_right_tri", "b", b, "A", A);
33  // FIXME: This is nice and general but requires some extra memory
34  // and copying.
35  if (TriView == Eigen::Lower) {
36  return transpose(mdivide_left_tri<Eigen::Upper>(transpose(A),
37  transpose(b)));
38  } else if (TriView == Eigen::Upper) {
39  return transpose(mdivide_left_tri<Eigen::Lower>(transpose(A),
40  transpose(b)));
41  }
42 
43  domain_error("mdivide_left_tri",
44  "triangular view must be Eigen::Lower or Eigen::Upper",
45  "", "");
46  }
47 
48  }
49 }
50 #endif
Eigen::Matrix< typename boost::math::tools::promote_args< T1, T2 >::type, R1, C2 > mdivide_right_tri(const Eigen::Matrix< T1, R1, C1 > &b, const Eigen::Matrix< T2, R2, C2 > &A)
Returns the solution of the system Ax=b when A is triangular.
void domain_error(const char *function, const char *name, const T &y, const char *msg1, const char *msg2)
Throw a domain error with a consistently formatted message.
void check_multiplicable(const char *function, const char *name1, const T1 &y1, const char *name2, const T2 &y2)
Check if the matrices can be multiplied.
void check_square(const char *function, const char *name, const Eigen::Matrix< T_y, Eigen::Dynamic, Eigen::Dynamic > &y)
Check if the specified matrix is square.
Eigen::Matrix< T, C, R > transpose(const Eigen::Matrix< T, R, C > &m)
Definition: transpose.hpp:12

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