Stan Math Library  2.11.0
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 
9 #include <boost/math/tools/promotion.hpp>
10 #include <stdexcept>
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  stan::math::check_square("mdivide_right_tri", "A", A);
32  stan::math::check_multiplicable("mdivide_right_tri",
33  "b", b,
34  "A", A);
35  // FIXME: This is nice and general but requires some extra memory
36  // and copying.
37  if (TriView == Eigen::Lower) {
38  return transpose(mdivide_left_tri<Eigen::Upper>(transpose(A),
39  transpose(b)));
40  } else if (TriView == Eigen::Upper) {
41  return transpose(mdivide_left_tri<Eigen::Lower>(transpose(A),
42  transpose(b)));
43  } else {
44  throw std::domain_error("triangular view must be Eigen::Lower or "
45  "Eigen::Upper");
46  }
47  }
48 
49  }
50 }
51 #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.
bool check_multiplicable(const char *function, const char *name1, const T1 &y1, const char *name2, const T2 &y2)
Return true if the matrices can be multiplied.
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.
Eigen::Matrix< T, C, R > transpose(const Eigen::Matrix< T, R, C > &m)
Definition: transpose.hpp:12
bool check_square(const char *function, const char *name, const Eigen::Matrix< T_y, Eigen::Dynamic, Eigen::Dynamic > &y)
Return true if the specified matrix is square.

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