qwt_math.h File Reference

#include "qwt_global.h"
#include <qmath.h>

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Macros
#define	LOG_MAX   1.0e100
	Maximum value for logarithmic scales. More...
#define	LOG_MIN   1.0e-100
	Minimum value for logarithmic scales. More...
#define	M_PI_2   (1.57079632679489661923)

Functions
double	qwtCubicPolynom (double x, double a, double b, double c, double d)
double	qwtDegrees (double degrees)
	Translate radians into degrees. More...
double	qwtFastAtan (double x)
	Approximation of arc tangent ( error below 0,005 radians ) More...
double	qwtFastAtan2 (double y, double x)
	Approximation of arc tangent ( error below 0,005 radians ) More...
int	qwtFuzzyCompare (double value1, double value2, double intervalSize)
	Compare 2 values, relative to an interval. More...
QWT_EXPORT double	qwtGetMax (const double *array, int size)
	Find the largest value in an array. More...
QWT_EXPORT double	qwtGetMin (const double *array, int size)
	Find the smallest value in an array. More...
QWT_EXPORT double	qwtNormalizeDegrees (double degrees)
	Normalize an angle to be int the range [0.0, 360.0[. More...
QWT_EXPORT double	qwtNormalizeRadians (double radians)
	Normalize an angle to be int the range [0.0, 2 * PI[. More...
double	qwtRadians (double degrees)
	Translate degrees into radians. More...
int	qwtSign (double x)
	Return the sign. More...
double	qwtSqr (double x)
	Return the square of a number. More...

Macro Definition Documentation

#define LOG_MAX   1.0e100

Maximum value for logarithmic scales.

Definition at line 42 of file qwt_math.h.

#define LOG_MIN   1.0e-100

Minimum value for logarithmic scales.

Definition at line 37 of file qwt_math.h.

#define M_PI_2   (1.57079632679489661923)

Definition at line 32 of file qwt_math.h.

Function Documentation

double qwtCubicPolynom ( double  x, double  a, double  b, double  c, double  d  )

inline

Definition at line 137 of file qwt_math.h.

double qwtDegrees ( double  degrees )

inline

Translate radians into degrees.

Definition at line 150 of file qwt_math.h.

double qwtFastAtan ( double  x )

inline

Approximation of arc tangent ( error below 0,005 radians )

Definition at line 94 of file qwt_math.h.

double qwtFastAtan2 ( double  y, double  x  )

inline

Approximation of arc tangent ( error below 0,005 radians )

Definition at line 106 of file qwt_math.h.

int qwtFuzzyCompare ( double  value1, double  value2, double  intervalSize  )

inline

Compare 2 values, relative to an interval.

Values are "equal", when :

Parameters

value1	First value to compare
value2	Second value to compare
intervalSize	interval size

Returns

0: if equal, -1: if value2 > value1, 1: if value1 > value2

Definition at line 63 of file qwt_math.h.

QWT_EXPORT double qwtGetMax	(	const double *	array,
		int	size
	)

Find the largest value in an array.

Parameters

array	Pointer to an array
size	Array size

Definition at line 35 of file qwt_math.cpp.

QWT_EXPORT double qwtGetMin	(	const double *	array,
		int	size
	)

Find the smallest value in an array.

Parameters

array	Pointer to an array
size	Array size

Definition at line 17 of file qwt_math.cpp.

QWT_EXPORT double qwtNormalizeDegrees

(

double

degrees

)

Normalize an angle to be int the range [0.0, 360.0[.

Parameters

radians

Angle in degrees

Returns

Normalized angle in degrees

Definition at line 67 of file qwt_math.cpp.

QWT_EXPORT double qwtNormalizeRadians

(

double

radians

)

Normalize an angle to be int the range [0.0, 2 * PI[.

Parameters

radians

Angle in radians

Returns

Normalized angle in radians

Definition at line 52 of file qwt_math.cpp.

double qwtRadians ( double  degrees )

inline

Translate degrees into radians.

Definition at line 144 of file qwt_math.h.

int qwtSign ( double  x )

inline

Return the sign.

Definition at line 77 of file qwt_math.h.

double qwtSqr ( double  x )

inline

Return the square of a number.

Definition at line 88 of file qwt_math.h.