Useful math equations in CCGL. 更多...

#include <cmath>
#include "basic.h"
#include "utils_array.h"

命名空间
namespace	ccgl
	Common Cross-platform Geographic Library (CCGL)

namespace	ccgl::utils_math
	Basic mathematics related functions

宏定义
#define	Max(a, b) ((a) >= (b) ? (a) : (b))
	Return maximum value

#define	Min(a, b) ((a) >= (b) ? (b) : (a))
	Return minimum value

#define	Abs(x) ((x) >= 0 ? (x) : -(x))
	Return absolute value

函数
template<typename T1 , typename T2 >
bool	ccgl::utils_math::FloatEqual (T1 v1, T2 v2)
	Whether v1 is equal to v2 更多...

float	ccgl::utils_math::Expo (float xx, float upper=20.f, float lower=-20.f)
	Check the argument against upper and lower boundary values prior to doing Exponential function

float	ccgl::utils_math::Power (float a, float n)
	deal with positive and negative float numbers

template<typename T >
T	ccgl::utils_math::MaxInArray (const T *a, int n)
	Get maximum value in a numeric array with size n. 更多...

template<typename T >
T	ccgl::utils_math::MinInArray (const T *a, int n)
	Get minimum value in a numeric array with size n. 更多...

template<typename T >
T	ccgl::utils_math::Sum (int row, const T *data)
	Sum of a numeric array Get sum value of a double array with size row. 更多...

template<typename T >
T	ccgl::utils_math::Sum (int row, int &idx, const T data)
	Sum of a numeric array Get sum value of a double array with size row and real index idx. 更多...

template<typename T >
void	ccgl::utils_math::BasicStatistics (const T values, int num, double *derivedvalues, T exclude=static_cast< T >(NODATA_VALUE))
	calculate basic statistics at one time_funcs 更多...

template<typename T >
void	ccgl::utils_math::BasicStatistics (const T const values, int num, int lyrs, double ***derivedvalues, T exclude=static_cast< T >(NODATA_VALUE))
	calculate basic statistics at one time_funcs for 2D raster data 更多...

float	ccgl::utils_math::ApprSqrt (float z)
	approximate sqrt 更多...

float	ccgl::utils_math::ApprLn (float z)
	Approximates the natural logarithm, (where the base is 'e'=2.71828)

float	ccgl::utils_math::pow_lookup (const float exp, const float log_base)
	lookup for pow(a, b) function 更多...

float	ccgl::utils_math::ApprPow (float a, float b)
	Approximates pow(a, b) based on the work of Harrison Ainsworth. 更多...

详细描述

Useful math equations in CCGL.

备注

1. 2018-05-02 - lj - Make part of CCGL.
2. 2021-07-15 - lj - Integrate pal.math for fast pow, exp, and ln

作者: Liangjun Zhu, zlj(a)lreis.ac.cn

版本: 1.1

命名空间

宏定义

函数

详细描述