// This file is generated by WOK (CPPExt).
// 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_Householder_HeaderFile
#define _math_Householder_HeaderFile

#ifndef _Standard_HeaderFile
#include <Standard.hxx>
#endif
#ifndef _Standard_Macro_HeaderFile
#include <Standard_Macro.hxx>
#endif

#ifndef _math_Matrix_HeaderFile
#include <math_Matrix.hxx>
#endif
#ifndef _Standard_Boolean_HeaderFile
#include <Standard_Boolean.hxx>
#endif
#ifndef _Standard_Integer_HeaderFile
#include <Standard_Integer.hxx>
#endif
#ifndef _Standard_Real_HeaderFile
#include <Standard_Real.hxx>
#endif
#ifndef _Standard_OStream_HeaderFile
#include <Standard_OStream.hxx>
#endif
class StdFail_NotDone;
class Standard_OutOfRange;
class Standard_DimensionError;
class Standard_ConstructionError;
class math_Matrix;
class math_Vector;


//! This class implements the least square solution of a set of <br>
//!          linear equations of m unknowns (n >= m) using the Householder <br>
//!          method. It solves A.X = B. <br>
//!          This algorithm has more numerical stability than <br>
//!          GaussLeastSquare but is longer. <br>
//!          It must be used if the matrix is singular or nearly singular. <br>
//!          It is about 16% longer than GaussLeastSquare if there is only <br>
//!          one member B to solve. <br>
//!          It is about 30% longer if there are twenty B members to solve. <br>
class math_Householder  {
public:

  void* operator new(size_t,void* anAddress) 
  {
    return anAddress;
  }
  void* operator new(size_t size) 
  {
    return Standard::Allocate(size); 
  }
  void  operator delete(void *anAddress) 
  {
    if (anAddress) Standard::Free((Standard_Address&)anAddress); 
  }

  //! Given an input matrix A with n>= m, given an input matrix B <br>
//!          this constructor performs the least square resolution of <br>
//!          the set of linear equations A.X = B for each column of B. <br>
//!          If a column norm is less than EPS, the resolution can't <br>
//!          be done. <br>
//!          Exception DimensionError is raised if the row number of B <br>
//!          is different from the A row number. <br>
  Standard_EXPORT   math_Householder(const math_Matrix& A,const math_Matrix& B,const Standard_Real EPS = 1.0e-20);
  //! Given an input matrix A with n>= m, given an input matrix B <br>
//!          this constructor performs the least square resolution of <br>
//!          the set of linear equations A.X = B for each column of B. <br>
//!          If a column norm is less than EPS, the resolution can't <br>
//!          be done. <br>
//!          Exception DimensionError is raised if the row number of B <br>
//!          is different from the A row number. <br>
  Standard_EXPORT   math_Householder(const math_Matrix& A,const math_Matrix& B,const Standard_Integer lowerArow,const Standard_Integer upperArow,const Standard_Integer lowerAcol,const Standard_Integer upperAcol,const Standard_Real EPS = 1.0e-20);
  //! Given an input matrix A with n>= m, given an input vector B <br>
//!          this constructor performs the least square resolution of <br>
//!          the set of linear equations A.X = B. <br>
//!          If a column norm is less than EPS, the resolution can't <br>
//!          be done. <br>
//!          Exception DimensionError is raised if the length of B <br>
//!          is different from the A row number. <br>
  Standard_EXPORT   math_Householder(const math_Matrix& A,const math_Vector& B,const Standard_Real EPS = 1.0e-20);
  //! Returns true if the computations are successful, otherwise returns false. <br>
        Standard_Boolean IsDone() const;
  //! Given the integer Index, this routine returns the <br>
//!          corresponding least square solution sol. <br>
//!          Exception NotDone is raised if the resolution has not be <br>
//!          done. <br>
//!          Exception OutOfRange is raised if Index <=0 or <br>
//!          Index is more than the number of columns of B. <br>
        void Value(math_Vector& sol,const Standard_Integer Index = 1) const;
  //! Returns the matrix sol of all the solutions of the system <br>
//!          A.X = B. <br>
//!          Exception NotDone is raised is the resolution has not be <br>
//!          done. <br>
       const math_Matrix& AllValues() const;
  //! Prints informations on the current state of the object. <br>
  Standard_EXPORT     void Dump(Standard_OStream& o) const;





protected:

  //! This method is used internally for each constructor <br>
//!          above and can't be used directly. <br>
  Standard_EXPORT     void Perform(const math_Matrix& A,const math_Matrix& B,const Standard_Real EPS) ;




private:



math_Matrix Sol;
math_Matrix Q;
Standard_Boolean Done;
Standard_Integer mylowerArow;
Standard_Integer myupperArow;
Standard_Integer mylowerAcol;
Standard_Integer myupperAcol;


};


#include <math_Householder.lxx>



// other Inline functions and methods (like "C++: function call" methods)


#endif