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qwt_math.h

qwt_math.h

Section: Qwt User's Guide (3) Updated: 16 Nov 2004
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NAME

qwt_math.h -  

Detailed Description

A set of mathematical routines.

Definition in file qwt_math.h.  

SYNOPSIS


 

Defines


#define LOG10_2 0.30102999566398119802

#define LOG10_3 0.47712125471966243540

#define LOG10_5 0.69897000433601885749

#define M_2PI 6.28318530717958623200

#define LOG_MIN 1.0e-100

#define LOG_MAX 1.0e100

#define M_E 2.7182818284590452354

#define M_LOG2E 1.4426950408889634074

#define M_LN2 0.69314718055994530942

#define M_LN10 2.30258509299404568402

#define M_PI 3.14159265358979323846

#define M_PI_2 1.57079632679489661923

#define M_PI_4 0.78539816339744830962

#define M_1_PI 0.31830988618379067154

#define M_2_PI 0.63661977236758134308

#define M_2_SQRTPI 1.12837916709551257390

#define M_SQRT2 1.41421356237309504880

#define M_SQRT1_2 0.70710678118654752440

#define qwtMax QMAX

#define qwtMin QMIN

#define qwtAbs QABS

#define qwtInt qRound
 

Functions


QWT_EXPORT double qwtCeil125 (double x)

QWT_EXPORT double qwtFloor125 (double x)

QWT_EXPORT double qwtGetMin (double *array, int size)

QWT_EXPORT double qwtGetMax (double *array, int size)

QWT_EXPORT void qwtTwistArray (double *array, int size)

QWT_EXPORT int qwtChkMono (double *array, int size)

QWT_EXPORT void qwtLinSpace (double *array, int size, double xmin, double xmax)

QWT_EXPORT void qwtLogSpace (double *array, int size, double xmin, double xmax)

template<class T> int qwtSign (const T &x)

template<class T> T qwtSqr (const T &x)

template<class T> void qwtCopyArray (T *dest, T *src, int n)

template<class T> void qwtShiftArray (T *arr, int size, int di)

template<class T> void qwtSwap (T &x1, T &x2)

template<class T> void qwtSort (const T &x1, const T &x2, T &xmin, T &xmax)

template<class T> void qwtSort (T &x1, T &x2)

template<class T> T qwtLim (const T &x, const T &x1, const T &x2)

QPoint qwtPolar2Pos (const QPoint &center, double radius, double angle)

QPoint qwtDegree2Pos (const QPoint &center, double radius, double angle)
 

Define Documentation

 

#define LOG_MAX 1.0e100

Maximum value for logarithmic scales.

Definition at line 46 of file qwt_math.h.

Referenced by QwtAutoScale::setRange(), and QwtAutoScale::setReference().  

#define LOG_MIN 1.0e-100

Mininum value for logarithmic scales.

Definition at line 41 of file qwt_math.h.

Referenced by QwtAutoScale::setRange(), and QwtAutoScale::setReference().  

Function Documentation

 

QWT_EXPORT double qwtCeil125 (double x)

Find the smallest value out of {1,2,5}*10^n with an integer number n which is greater than or equal to x.

Parameters:

x Input value

Definition at line 56 of file qwt_math.cpp.  

QWT_EXPORT int qwtChkMono (double * array, int size)

Checks if an array is a strictly monotonic sequence.

Parameters:

array Pointer to an array
size Size of the array

Returns:

0
sequence is not strictly monotonic
1
sequence is strictly monotonically increasing
-1
sequence is strictly monotonically decreasing

Definition at line 119 of file qwt_math.cpp.  

template<class T> void qwtCopyArray (T * dest, T * src, int n)

Copy an array into another.

Parameters:

dest Destination
src Source
n Number of elements

Definition at line 142 of file qwt_math.h.

Referenced by qwtShiftArray().  

QWT_EXPORT double qwtFloor125 (double x)

Find the largest value out of {1,2,5}*10^n with an integer number n which is smaller than or equal to x.

Parameters:

x Input value

Definition at line 85 of file qwt_math.cpp.  

QWT_EXPORT double qwtGetMax (double * array, int size)

Find the largest value in an array.

Parameters:

array Pointer to an array
size Array size

Definition at line 37 of file qwt_math.cpp.  

QWT_EXPORT double qwtGetMin (double * array, int size)

Find the smallest value in an array.

Parameters:

array Pointer to an array
size Array size

Definition at line 19 of file qwt_math.cpp.  

template<class T> T qwtLim (const T & x, const T & x1, const T & x2)

Limit a value to fit into a specified interval.

Parameters:

x Input value
x1 First interval boundary
x2 Second interval boundary

Definition at line 245 of file qwt_math.h.

Referenced by QwtArrowButton::QwtArrowButton(), QwtScaleDraw::setAngleRange(), QwtDblRange::setRange(), QwtWheel::setTickCnt(), QwtWheel::setTotalAngle(), QwtWheel::setViewAngle(), and QwtCurve::verifyRange().  

QWT_EXPORT void qwtLinSpace (double * array, int size, double xmin, double xmax)

Create an array of equally spaced values.

Parameters:

array Where to put the values
size Size of the array
xmin Value associated with index 0
xmax Value associated with index (size-1)

Definition at line 161 of file qwt_math.cpp.  

QWT_EXPORT void qwtLogSpace (double * array, int size, double xmin, double xmax)

Create an array of logarithmically equally spaced values.

Parameters:

array Where to put the values
size Size of the array
xmin Value associated with index 0
xmax Value associated with index (size-1)

Definition at line 189 of file qwt_math.cpp.  

template<class T> void qwtShiftArray (T * arr, int size, int di)

Shift an array by a specified number of positions.

Parameters:

arr Pointer to an array
size Number of elements
di Number of positions. A positive number shifts right, a negative number shifts left.

Definition at line 157 of file qwt_math.h.

References qwtCopyArray().  

template<class T> int qwtSign (const T & x)

Return the sign.

Definition at line 118 of file qwt_math.h.  

template<class T> void qwtSort (T & x1, T & x2)

Sort two values in ascending order.

Definition at line 226 of file qwt_math.h.

Referenced by QwtCurve::verifyRange().  

template<class T> void qwtSort (const T & x1, const T & x2, T & xmin, T & xmax)

Sort two values in ascending order.

Parameters:

x1 First input value
x2 Second input value
xmax Greater value
xmin Smaller value

Definition at line 207 of file qwt_math.h.  

template<class T> T qwtSqr (const T & x)

Return the square of a number.

Definition at line 130 of file qwt_math.h.

Referenced by QwtPlot::closestCurve(), QwtPlot::closestMarker(), and QwtCurve::drawSpline().  

template<class T> void qwtSwap (T & x1, T & x2)

Swap two values.

Definition at line 190 of file qwt_math.h.  

QWT_EXPORT void qwtTwistArray (double * array, int size)

Invert the order of array elements.

Parameters:

array Pointer to an array
size Size of the array

Definition at line 141 of file qwt_math.cpp.  

Author

Generated automatically by Doxygen for Qwt User's Guide from the source code.


 

Index

NAME
Detailed Description
SYNOPSIS
Defines
Functions
Define Documentation
#define LOG_MAX 1.0e100
#define LOG_MIN 1.0e-100
Function Documentation
QWT_EXPORT double qwtCeil125 (double x)
QWT_EXPORT int qwtChkMono (double * array, int size)
template<class T> void qwtCopyArray (T * dest, T * src, int n)
QWT_EXPORT double qwtFloor125 (double x)
QWT_EXPORT double qwtGetMax (double * array, int size)
QWT_EXPORT double qwtGetMin (double * array, int size)
template<class T> T qwtLim (const T & x, const T & x1, const T & x2)
QWT_EXPORT void qwtLinSpace (double * array, int size, double xmin, double xmax)
QWT_EXPORT void qwtLogSpace (double * array, int size, double xmin, double xmax)
template<class T> void qwtShiftArray (T * arr, int size, int di)
template<class T> int qwtSign (const T & x)
template<class T> void qwtSort (T & x1, T & x2)
template<class T> void qwtSort (const T & x1, const T & x2, T & xmin, T & xmax)
template<class T> T qwtSqr (const T & x)
template<class T> void qwtSwap (T & x1, T & x2)
QWT_EXPORT void qwtTwistArray (double * array, int size)
Author

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Time: 21:53:52 GMT, April 16, 2011