localgaussianrandomfunction.h

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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 localgaussianrandomfunction_h
#define localgaussianrandomfunction_h
 
#include "function.h"


#define _IFT_LocalGaussianRandomFunction_Name "localgaussrandomfunction"
#define _IFT_LocalGaussianRandomFunction_mean "mean"
#define _IFT_LocalGaussianRandomFunction_variance "variance"
#define _IFT_LocalGaussianRandomFunction_seed "seed"
 
namespace oofem {
class OOFEM_EXPORT LocalGaussianRandomFunction : public Function
{
protected:
    long randomInteger;
    double mean, variance;
 
public:
    LocalGaussianRandomFunction(int n, Domain * d);
    virtual ~LocalGaussianRandomFunction();
 
    void evaluate(FloatArray &answer, const std :: map< std :: string, FunctionArgument > &valDict, GaussPoint *gp=nullptr, double param=0.) override;
    double evaluateAtTime(double t) override;
    double evaluateVelocityAtTime(double t) override;
    double evaluateAccelerationAtTime(double t) override;
 
    void initializeFrom(InputRecord &ir) override;
    const char *giveClassName() const override { return "LocalGaussianRandomFunction"; }
    const char *giveInputRecordName() const override { return _IFT_LocalGaussianRandomFunction_Name; }
 
protected:
    double ran1(long *idum);

    double normalCdfInverse(double cdf, double a, double b);

    double normal01CdfInverse(double p);
 
    double dpolyValue(int n, double a[], double x);
};
} // end namespace oofem
#endif