fglmgauss.h

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// emacs edit mode for this file is -*- C++ -*-
 
/****************************************
*  Computer Algebra System SINGULAR     *
****************************************/
/*
* ABSTRACT - header file for the gauss - reducer
*            (used by fglm)
*/
#ifndef FGLMGAUSS_H
#define FGLMGAUSS_H
 
#include "kernel/structs.h"
#include "kernel/fglm/fglmvec.h"
 
class gaussElem;
 
class gaussReducer
{
private:
    gaussElem * elems;
    BOOLEAN * isPivot;
    int * perm;
    fglmVector v;
    fglmVector p;
    number pdenom;
    int size;
    int max;
public:
    gaussReducer( int dimen );
    ~gaussReducer();
 
    // reduce returns TRUE, if v reduces to 0, FALSE otherwise;
    BOOLEAN reduce( fglmVector v );
 
    // if a vector does not reduce to zero, then it can be stored as a new gauss
    // vector.
    // Has to be called after reduce!
    void store();
 
    // if a vector reduces to zero, then one can get the corresponding fglmVector
    // of the linear dependence
    // Has to be called after reduce!
    fglmVector getDependence();
};
 
#endif