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 - 2025   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:
    FloatArray mtrx;
    IntArray adr;
    int isFactorized;
 
public:
    Skyline(int n=0);
    Skyline(const Skyline &s);
    Skyline(int n, FloatArray mtrx, IntArray adr);
    virtual ~Skyline() {}
 
    std::unique_ptr<SparseMtrx> clone() const override;
 
    void times(const FloatArray &x, FloatArray &answer) const override;
    void timesT(const FloatArray &x, FloatArray &answer) const override { this->times(x, answer); }
    void times(double x) override;
    void add(double x, SparseMtrx &m) override;
    int buildInternalStructure(EngngModel *, int, const UnknownNumberingScheme &) override;
 
    std::unique_ptr<SparseMtrx> giveSubMatrix(const IntArray &rows, const IntArray &cols) override; 
    int setInternalStructure(IntArray a);
 
    int assemble(const IntArray &loc, const FloatMatrix &mat) override;
    int assemble(const IntArray &rloc, const IntArray &cloc, const FloatMatrix &mat) override;
 
    bool canBeFactorized() const override { return true; }
    SparseMtrx *factorized() override;
    FloatArray *backSubstitutionWith(FloatArray &) const override;
    void zero() override;
    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);
 
    double &at(int, int) override;
    double at(int i, int j) const override;
    bool isAllocatedAt(int i, int j) const override;
    int giveNumberOfNonZeros() const { return this->mtrx.giveSize(); }
    void toFloatMatrix(FloatMatrix &answer) const override;
    void printYourself() const override;
    void writeToFile(const char *fname) const override;
    int giveAllocatedSize() { return this->mtrx.giveSize(); }
 
    SparseMtrxType giveType() const override { return SMT_Skyline; }
    bool isAsymmetric() const override { return false; }
 
    const char *giveClassName() const override { return "Skyline"; }
};
} // end namespace oofem
#endif // skyline_h