MathLib::Nonlinear::detail Namespace Reference

Functions
bool	same_sign (double a, double b)
	Tells if a and b have the same sign.
bool	almost_zero (double a)

Function Documentation

almost_zero()

bool MathLib::Nonlinear::detail::almost_zero ( double a )

inline

Definition at line 38 of file Root1D.h.

{
    return std::abs(a) <= std::numeric_limits<double>::epsilon();
}

Referenced by MathLib::Nonlinear::RegulaFalsi< SubType, Function >::RegulaFalsi(), and MathLib::Nonlinear::RegulaFalsi< SubType, Function >::step().

same_sign()

bool MathLib::Nonlinear::detail::same_sign ( double a, double b )

inline

Tells if a and b have the same sign.

Definition at line 30 of file Root1D.h.

{
    // note: signbit() casts integers to double and distinguishes between +0.0 and
    // -0.0. However, the latter is not a problem, because if f(x0) == 0, we've
    // already found the root x0 that we are searching for.
    return std::signbit(a) == std::signbit(b);
}

Referenced by MathLib::Nonlinear::RegulaFalsi< SubType, Function >::RegulaFalsi(), and MathLib::Nonlinear::RegulaFalsi< SubType, Function >::step().