function.C

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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
 */
 
#include "function.h"
#include "timestep.h"
#include "error.h"
#include "domain.h"
#include "gausspoint.h"
#include "datastream.h"
#include "contextioerr.h"
 
namespace oofem {
Function :: Function(int n, Domain *d) :
    FEMComponent(n, d)
{ this->parameterType=0; }
 
double
Function :: giveFunctionParameter(int paramID)
{
    if(this->giveDomain()->giveElement(this->giveNumber())!=NULL)
        return 1.;
    return 0.;
}
 
double
Function :: evaluate(TimeStep *tStep, ValueModeType mode)
{
    if ( mode == VM_Total ) {
        return this->evaluateAtTime( tStep->giveIntrinsicTime() );
    } else if ( mode == VM_Velocity ) {
        return this->evaluateVelocityAtTime( tStep->giveIntrinsicTime() );
    } else if ( mode == VM_Acceleration ) {
        return this->evaluateAccelerationAtTime( tStep->giveIntrinsicTime() );
    } else if ( mode == VM_Incremental ) {
        return this->evaluateAtTime( tStep->giveIntrinsicTime() ) - this->evaluateAtTime( tStep->giveIntrinsicTime() - tStep->giveTimeIncrement() );
    } else if ((mode == VM_Intermediate) || (mode == VM_TotalIntrinsic)) {
      return this->evaluateAtTime( tStep->giveIntrinsicTime() );
    } else {
        OOFEM_ERROR("unsupported mode(%d)", mode);
    }
 
    // return 0.;
}
 
 
double
Function :: evaluateAtTime(double t)
{
    FloatArray v;
    this->evaluate(v, {{"t",t}});
    if ( v.giveSize() != 1 ) {
        OOFEM_ERROR("Function doesn't return scalar results.");
    }
    return v.at(1);
}
 
 
void
Function :: evaluate(FloatArray &answer, const std :: map< std :: string, FunctionArgument > &valDict, GaussPoint *gp, double param)
{
    if(this->parameterType==0)
    {
        auto it = valDict.find("t");
        if ( it == valDict.end() )
        {
            OOFEM_ERROR("Missing necessary argument \"t\"");
        }else{
            answer = Vec1(this->evaluateAtTime(it->second.val0));
        }
    }
    else if(this->parameterType==1)
    {
        answer = Vec1(this->evaluateAtTime(param));
    }
    else
        OOFEM_ERROR("Unknown parameter type %d",parameterType);
}
 
double
Function :: evaluate(const std :: map< std :: string, FunctionArgument > &valDict)
{
    FloatArray ans;
    this->evaluate(ans, valDict);
    if ( ans.giveSize() != 1 ) {
        OOFEM_ERROR("Function does not return scalar value");
    }
    return ans[0];
}
 
void
Function :: saveContext(DataStream &stream, ContextMode mode)
{
    FEMComponent :: saveContext(stream, mode);
 
    if ( mode & CM_Definition ) {
        if ( !stream.write(parameterType) ) {
          THROW_CIOERR(CIO_IOERR);
        }
    }
}
 
 
void
Function :: restoreContext(DataStream &stream, ContextMode mode)
{
    FEMComponent :: restoreContext(stream, mode);
 
    if ( mode & CM_Definition ) {
        if ( !stream.read(parameterType) ) {
          THROW_CIOERR(CIO_IOERR);
        }
    }
}
 
} // end namespace oofem