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pwiz::math::LinearSolver< LinearSolverType_QR > Class Reference

#include <LinearSolver.hpp>

Public Member Functions

template<typename matrix_type , typename vector_type >
vector_type solve (const matrix_type &A, const vector_type &y)
 solve system of linear equations Ax = y using boost::ublas; note: extra copying inefficiencies for ease of client use

 

Detailed Description

Definition at line 82 of file LinearSolver.hpp.

Member Function Documentation

◆ solve()

template<typename matrix_type , typename vector_type >
vector_type pwiz::math::LinearSolver< LinearSolverType_QR >::solve ( const matrix_type &  A,
const vector_type &  y 
)
inline

solve system of linear equations Ax = y using boost::ublas; note: extra copying inefficiencies for ease of client use

Definition at line 89 of file LinearSolver.hpp.

90 {
91 typedef typename matrix_type::size_type size_type;
92 typedef typename matrix_type::value_type value_type;
93
94 namespace ublas = boost::numeric::ublas;
95
96 matrix_type Q(A.size1(), A.size2()), R(A.size1(), A.size2());
97
98 qr (A, Q, R);
99
100 vector_type b = prod(trans(Q), y);
101
102 vector_type result;
103 if (R.size1() > R.size2())
104 {
105 size_type min = (R.size1() < R.size2() ? R.size1() : R.size2());
106
107 result = ublas::solve(subrange(R, 0, min, 0, min),
108 subrange(b, 0, min),
109 ublas::upper_tag());
110 }
111 else
112 {
113 result = ublas::solve(R, b, ublas::upper_tag());
114 }
115 return result;
116 }
#define A
KernelTraitsBase< Kernel >::space_type::ordinate_type y
void qr(const matrix_type &A, matrix_type &Q, matrix_type &R)
Definition qr.hpp:81

References A, pwiz::math::qr(), and y.


The documentation for this class was generated from the following file: