MathsCustomFunctions.hpp

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/*

Copyright (C) University of Oxford, 2005-2011

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University of Oxford, having an administrative office at Wellington
Square, Oxford OX1 2JD, UK.

This file is part of Chaste.

Chaste is free software: you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published
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(at your option) any later version.

Chaste is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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License for more details. The offer of Chaste under the terms of the
License is subject to the License being interpreted in accordance with
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You should have received a copy of the GNU Lesser General Public License
along with Chaste. If not, see <http://www.gnu.org/licenses/>.

*/

#ifndef MATHSCUSTOMFUNCTIONS_HPP_
#define MATHSCUSTOMFUNCTIONS_HPP_

#include <cfloat>

double SmallPow(double x, unsigned exponent);

bool Divides(double smallerNumber, double largerNumber);

class CompareDoubles
{
public:
    static bool IsNearZero(double number, double tolerance);

    static bool WithinRelativeTolerance(double number1, double number2, double tolerance);

    static bool WithinAbsoluteTolerance(double number1, double number2, double tolerance);

    static bool WithinTolerance(double number1, double number2, double tolerance, bool toleranceIsAbsolute);

    static bool WithinAnyTolerance(double number1, double number2,
                                   double relTol=DBL_EPSILON, double absTol=DBL_EPSILON,
                                   bool printError=false);

    static double Difference(double number1, double number2, bool toleranceIsAbsolute);
};

#endif /*MATHSCUSTOMFUNCTIONS_HPP_*/