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qwt_math.h File Reference

A set of mathematical routines. More...


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

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> const T & qwtMax (const T &x, const T &y)
template<class T> const T & qwtMin (const T &x, const T &y)
template<class T> T qwtAbs (const T &x)
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)
int qwtInt (double x)
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)


Detailed Description

A set of mathematical routines.


Function Documentation

template<class T>
T qwtAbs const T &    x
 

Return the absolute value.

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

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

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

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

QWT_EXPORT double qwtGetMax double *    array,
int    size
 

Find the largest value in an array.

Parameters:
array  Pointer to an array
size  Array size

QWT_EXPORT double qwtGetMin double *    array,
int    size
 

Find the smallest value in an array.

Parameters:
array  Pointer to an array
size  Array size

int qwtInt double    x
 

Round a number to the nearest integer.

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

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)

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)

template<class T>
const T& qwtMax const T &    x,
const T &    y
 

Return the largest of two values.

template<class T>
const T& qwtMin const T &    x,
const T &    y
 

Return the smallest of two values.

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.

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


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