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qwt_math.h File Reference


Detailed Description

A set of mathematical routines.


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

double qwtCeil125 (double x)
double qwtFloor125 (double x)
double qwtGetMin (double *array, int size)
double qwtGetMax (double *array, int size)
void qwtTwistArray (double *array, int size)
int qwtChkMono (double *array, int size)
void qwtLinSpace (double *array, int size, double xmin, double xmax)
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)


Function Documentation

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

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

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

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

double qwtGetMax double *  array,
int  size
 

Find the largest value in an array.

Parameters:
array Pointer to an array
size Array size

double qwtGetMin double *  array,
int  size
 

Find the smallest value in an array.

Parameters:
array Pointer to an array
size Array size

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

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)

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)

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.

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

Return the sign.

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

Sort two values in ascending order.

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

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

Return the square of a number.

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

Swap two values.

void qwtTwistArray double *  array,
int  size
 

Invert the order of array elements.

Parameters:
array Pointer to an array
size Size of the array


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