tsgMathUtils.hpp File Reference

Math functions and constants. More...

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Namespaces
namespace	TasGrid
	Encapsulates the Tasmanian Sparse Grid module.
namespace	TasGrid::Maths
	Math functions and constants.

Functions
int	TasGrid::Maths::intlog2 (int i)
	Computes std::floor(std::log2(i)), but uses only integer operations.
int	TasGrid::Maths::int2log2 (int i)
	Computes std::pow(2, std::floor(std::log2(i))), but uses only integer operations.
int	TasGrid::Maths::int3log3 (int i)
	Computes std::pow(3, std::floor(std::log(i) / std::log(2))), but uses only integer operations.
int	TasGrid::Maths::pow2 (int p)
	Computes std::pow(2, p), but uses only integer operations.
int	TasGrid::Maths::pow3 (int p)
	Computes std::pow(3, p), but uses only integer operations.
double	TasGrid::Maths::sign (double p)
	Returns +1 or -1 with the same sign as p.

Variables
constexpr double	TasGrid::Maths::pi = 3.14159265358979323846
	Half-period of the std::sin() and std::cos() functions.
constexpr double	TasGrid::Maths::num_tol = 1.E-12
	Numerical tolerance for various algorithms.

Detailed Description

Math functions and constants.

Author

Miroslav Stoyanov

Simple functions and constnats used throughout the internal algorithms of Tasmanian.