/usr/include/oce/math_GaussLeastSquare.hxx is in liboce-foundation-dev 0.17.2-2.
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// Please do not edit this file; modify original file instead.
// The copyright and license terms as defined for the original file apply to
// this header file considered to be the "object code" form of the original source.
#ifndef _math_GaussLeastSquare_HeaderFile
#define _math_GaussLeastSquare_HeaderFile
#include <Standard.hxx>
#include <Standard_DefineAlloc.hxx>
#include <Standard_Macro.hxx>
#include <Standard_Boolean.hxx>
#include <math_Matrix.hxx>
#include <math_IntegerVector.hxx>
#include <Standard_Real.hxx>
#include <math_Vector.hxx>
#include <Standard_OStream.hxx>
class StdFail_NotDone;
class Standard_DimensionError;
class math_Matrix;
//! This class implements the least square solution of a set of
//! n linear equations of m unknowns (n >= m) using the gauss LU
//! decomposition algorithm.
//! This algorithm is more likely subject to numerical instability
//! than math_SVD.
class math_GaussLeastSquare
{
public:
DEFINE_STANDARD_ALLOC
//! Given an input n X m matrix A with n >= m this constructor
//! performs the LU decomposition with partial pivoting
//! (interchange of rows) of the matrix AA = A.Transposed() * A;
//! This LU decomposition is stored internally and may be used
//! to do subsequent calculation.
//! If the largest pivot found is less than MinPivot the matrix <A>
//! is considered as singular.
Standard_EXPORT math_GaussLeastSquare(const math_Matrix& A, const Standard_Real MinPivot = 1.0e-20);
//! Returns true if the computations are successful, otherwise returns false.e
Standard_Boolean IsDone() const;
//! Given the input Vector <B> this routine solves the set
//! of linear equations A . X = B.
//! Exception NotDone is raised if the decomposition of A was
//! not done successfully.
//! Exception DimensionError is raised if the range of B Inv is
//! not equal to the rowrange of A.
//! Exception DimensionError is raised if the range of X Inv is
//! not equal to the colrange of A.
Standard_EXPORT void Solve (const math_Vector& B, math_Vector& X) const;
//! Prints on the stream o information on the current state
//! of the object.
//! Is used to redefine the operator <<.
Standard_EXPORT void Dump (Standard_OStream& o) const;
protected:
Standard_Boolean Singular;
math_Matrix LU;
math_Matrix A2;
math_IntegerVector Index;
Standard_Real D;
private:
Standard_Boolean Done;
};
#include <math_GaussLeastSquare.lxx>
#endif // _math_GaussLeastSquare_HeaderFile
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