93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | foam-extend: Open Source CFD
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\\ / O peration | Version: 4.0
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\\ / A nd | Web: http://www.foam-extend.org
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\\/ M anipulation | For copyright notice see file Copyright
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-------------------------------------------------------------------------------
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License
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This file is part of foam-extend.
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foam-extend is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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foam-extend is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with foam-extend. If not, see <http://www.gnu.org/licenses/>.
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Application
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findRoot
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Description
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Test root-finding functions
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\*---------------------------------------------------------------------------*/
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#include "fvCFD.H"
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#include "IOmanip.H"
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#include "BisectionRoot.H"
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#include "RiddersRoot.H"
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#include "NewtonSecantRoot.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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class testFunction
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{
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public:
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testFunction()
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{}
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scalar operator()(const scalar& x) const
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{
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return sqr(x) - 1 - Foam::sin(x);
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}
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};
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class testFunctionDerivative
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{
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public:
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testFunctionDerivative()
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{}
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scalar operator()(const scalar& x) const
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{
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return 0.5*Foam::pow(x, -1.5) - Foam::cos(x);
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}
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};
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int main(int argc, char *argv[])
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{
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testFunction tf;
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testFunctionDerivative df;
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Info<< setprecision(10)
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<< "Bisection root "
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<< BisectionRoot<testFunction>(tf, 1e-5).root(0, 10) << nl
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<< "Ridders root "
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<< RiddersRoot<testFunction>(tf, 1e-5).root(0, 10) << nl
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<< "NewtonSecant root "
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<< NewtonSecantRoot<testFunction, testFunctionDerivative>
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(
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tf,
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df,
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1e-5
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).root(1.5) << endl;
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Info<< "End\n" << endl;
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return(0);
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}
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// ************************************************************************* //
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