Open CASCADE Technology  7.7.0.dev
Public Member Functions

math_Crout Class Reference

This class implements the Crout algorithm used to solve a system A*X = B where A is a symmetric matrix. It can be used to invert a symmetric matrix. This algorithm is similar to Gauss but is faster than Gauss. Only the inferior triangle of A and the diagonal can be given. More...

#include <math_Crout.hxx>

Public Member Functions

 math_Crout (const math_Matrix &A, const Standard_Real MinPivot=1.0e-20)
 Given an input matrix A, this algorithm inverts A by the Crout algorithm. The user can give only the inferior triangle for the implementation. A can be decomposed like this: A = L * D * T(L) where L is triangular inferior and D is diagonal. If one element of A is less than MinPivot, A is considered as singular. Exception NotSquare is raised if A is not a square matrix. More...
 
Standard_Boolean IsDone () const
 Returns True if all has been correctly done. More...
 
void Solve (const math_Vector &B, math_Vector &X) const
 Given an input vector , this routine returns the solution of the set of linear equations A . X = B. Exception NotDone is raised if the decomposition was not done successfully. Exception DimensionError is raised if the range of B is not equal to the rowrange of A. More...
 
const math_MatrixInverse () const
 returns the inverse matrix of A. Only the inferior triangle is returned. Exception NotDone is raised if NotDone. More...
 
void Invert (math_Matrix &Inv) const
 returns in Inv the inverse matrix of A. Only the inferior triangle is returned. Exception NotDone is raised if NotDone. More...
 
Standard_Real Determinant () const
 Returns the value of the determinant of the previously LU decomposed matrix A. Zero is returned if the matrix A is considered as singular. Exceptions StdFail_NotDone if the algorithm fails (and IsDone returns false). More...
 
void Dump (Standard_OStream &o) const
 Prints on the stream o information on the current state of the object. More...
 

Detailed Description

This class implements the Crout algorithm used to solve a system A*X = B where A is a symmetric matrix. It can be used to invert a symmetric matrix. This algorithm is similar to Gauss but is faster than Gauss. Only the inferior triangle of A and the diagonal can be given.

Constructor & Destructor Documentation

◆ math_Crout()

math_Crout::math_Crout ( const math_Matrix A,
const Standard_Real  MinPivot = 1.0e-20 
)

Given an input matrix A, this algorithm inverts A by the Crout algorithm. The user can give only the inferior triangle for the implementation. A can be decomposed like this: A = L * D * T(L) where L is triangular inferior and D is diagonal. If one element of A is less than MinPivot, A is considered as singular. Exception NotSquare is raised if A is not a square matrix.

Member Function Documentation

◆ Determinant()

Standard_Real math_Crout::Determinant ( ) const

Returns the value of the determinant of the previously LU decomposed matrix A. Zero is returned if the matrix A is considered as singular. Exceptions StdFail_NotDone if the algorithm fails (and IsDone returns false).

◆ Dump()

void math_Crout::Dump ( Standard_OStream o) const

Prints on the stream o information on the current state of the object.

◆ Inverse()

const math_Matrix& math_Crout::Inverse ( ) const

returns the inverse matrix of A. Only the inferior triangle is returned. Exception NotDone is raised if NotDone.

◆ Invert()

void math_Crout::Invert ( math_Matrix Inv) const

returns in Inv the inverse matrix of A. Only the inferior triangle is returned. Exception NotDone is raised if NotDone.

◆ IsDone()

Standard_Boolean math_Crout::IsDone ( ) const

Returns True if all has been correctly done.

◆ Solve()

void math_Crout::Solve ( const math_Vector B,
math_Vector X 
) const

Given an input vector , this routine returns the solution of the set of linear equations A . X = B. Exception NotDone is raised if the decomposition was not done successfully. Exception DimensionError is raised if the range of B is not equal to the rowrange of A.


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