Scalar.h

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// This file is part of the Peano project. For conditions of distribution and
// use, please see the copyright notice at www.peano-framework.org
#pragma once
 
#include <limits>
 
namespace tarch {
  namespace la {
#if defined(GPUOffloadingOMP)
#pragma omp declare target
#endif
    constexpr double PI = 3.1415926535897932384626433832795028841972;
    constexpr double E  = 2.7182818284590452353602874713526624977572;
#ifdef MACHINE_PRECISION
    constexpr double NUMERICAL_ZERO_DIFFERENCE = MACHINE_PRECISION;
#else
    constexpr double NUMERICAL_ZERO_DIFFERENCE = 1.0e-8;
#endif
#if defined(GPUOffloadingOMP)
#pragma omp end declare target
#endif
 
    double relativeEpsNormalisedAgainstValueGreaterOne(
      double valueA, double valueB = std::numeric_limits<double>::min(), double eps = NUMERICAL_ZERO_DIFFERENCE
    );
 
    double relativeEps(
      double valueA, double valueB = std::numeric_limits<double>::min(), double eps = NUMERICAL_ZERO_DIFFERENCE
    );
 
    double max(double a, double b, double c);
 
    double pow(double base, double exponent);
 
    double convertAbsoluteIntoRelativeValue(double referenceValue, double value);
  } // namespace la
} // namespace tarch