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/*!
@authors Andrei Novikov (pyclustering@yandex.ru)
@date 2014-2020
@copyright BSD-3-Clause
*/
#pragma once
namespace pyclustering {
namespace utils {
namespace math {
/*!
@brief Mathematical constant pi.
*/
const double pi = 3.14159265358979323846;
/**
*
* @brief Calculates Heaviside function.
* @details If value >= 0.0 then 1.0 is returned, otherwise 0.0 is returned.
*
* @param[in] value: Input argument of the Heaviside function.
*
* @return Returns result of Heaviside function.
*
*/
double heaviside(const double value);
/**
*
* @brief Calculates absolute difference between two objects.
*
* @param[in] p_value1: The first value of the operation.
* @param[in] p_value2: The second value of the operation.
*
* @return Returns absolute difference.
*
*/
template <class TypeValue>
TypeValue absolute_difference(const TypeValue & p_value1, const TypeValue & p_value2) {
return (p_value1 >= p_value2) ? p_value1 - p_value2 : p_value2 - p_value1;
}
}
}
}
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