skyline.h

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/*
 *
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 *               ##   ##  ##   ##  ##      ##      ## ### ##
 *              ##   ##  ##   ##  ####    ####    ##  #  ##
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 *            ##   ##  ##   ##  ##      ##      ##     ##
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 *
 *
 *             OOFEM : Object Oriented Finite Element Code
 *
 *               Copyright (C) 1993 - 2013   Borek Patzak
 *
 *
 *
 *       Czech Technical University, Faculty of Civil Engineering,
 *   Department of Structural Mechanics, 166 29 Prague, Czech Republic
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef skyline_h
#define skyline_h

#include "sparsemtrx.h"

#define _IFT_Skyline_Name "skyline"

namespace oofem {
class OOFEM_EXPORT Skyline : public SparseMtrx
{
protected:
    int nwk;
    IntArray adr;
    double *mtrx;
    int isFactorized;

public:
    Skyline(int n);
    Skyline();
    virtual ~Skyline();

    virtual SparseMtrx *GiveCopy() const;

    virtual void times(const FloatArray &x, FloatArray &answer) const;
    virtual void timesT(const FloatArray &x, FloatArray &answer) const { this->times(x, answer); }
    virtual void times(double x);
    virtual void add(double x, SparseMtrx &m);
    virtual int buildInternalStructure(EngngModel *, int, const UnknownNumberingScheme &);

    //virtual Skyline *giveSubMatrix(Skyline &mat, IntArray &rows, IntArray &cols);
    //virtual Skyline *beSubMatrixOf(const Skyline &mat, IntArray &rows, IntArray &cols);
    //virtual SparseMtrx *beSubMatrixOf(const SparseMtrx &mat, IntArray &rows, IntArray &cols);
    virtual SparseMtrx *giveSubMatrix(const IntArray &rows, const IntArray &cols); 
    int setInternalStructure(IntArray &a);

    virtual int assemble(const IntArray &loc, const FloatMatrix &mat);
    virtual int assemble(const IntArray &rloc, const IntArray &cloc, const FloatMatrix &mat);

    virtual bool canBeFactorized() const { return true; }
    virtual SparseMtrx *factorized();
    virtual FloatArray *backSubstitutionWith(FloatArray &) const;
    virtual void zero();
    void rbmodes(FloatMatrix &r, int &nse, IntArray &se, double limit, int tc);
    void ldl_feti_sky(FloatArray &x, FloatArray &y, int nse, double limit, IntArray &se);
    virtual double &at(int, int);
    virtual double at(int i, int j) const;
    virtual bool isAllocatedAt(int i, int j) const;
    int giveNumberOfNonZeros() const { return this->nwk; }
    virtual void toFloatMatrix(FloatMatrix &answer) const;
    virtual void printYourself() const;
    virtual void writeToFile(const char *fname) const;
    int giveAllocatedSize() { return nwk; }

    virtual SparseMtrxType giveType() const { return SMT_Skyline; }
    virtual bool isAsymmetric() const { return false; }

    virtual const char *giveClassName() const { return "Skyline"; }

protected:
    Skyline(int, int, double *, const IntArray &);
};
} // end namespace oofem
#endif // skyline_h