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WV_FN_COIFLET

Syntax | Return Value | Arguments | Keywords | Version History | See Also

The WV_FN_COIFLET function constructs wavelet coefficients for the coiflet wavelet function.

Syntax

Result = WV_FN_COIFLET( [Order, Scaling, Wavelet, Ioff, Joff] )

Return Value

The returned value of this function is an anonymous structure of information about the particular wavelet.

Table 4-6: Structure Tags for Result 

Table 4-6: Structure Tags for Result 
Tag
Type
Definition
FAMILY
STRING
`Coiflet'
ORDER_NAME
STRING
`Order'
ORDER_RANGE
INTARR(3)
[1, 5, 1] Valid order range [first, last, default]
ORDER
INT
The chosen Order
DISCRETE
INT
1 [0=continuous, 1=discrete]
ORTHOGONAL
INT
1 [0=nonorthogonal, 1=orthogonal]
SYMMETRIC
INT
2 [0=asymmetric, 1=symm., 2=near symm.]
SUPPORT
INT
6*Order – 1 [Compact support width]
MOMENTS
INT
2*Order [Number of vanishing moments]
REGULARITY
DOUBLE
The number of continuous derivatives

Arguments

Order

A scalar that specifies the order number for the wavelet. The default is 1.

Scaling

On output, contains a vector of double-precision scaling (father) coefficients.

Wavelet

On output, contains a vector of double-precision wavelet (mother) coefficients.

Ioff

On output, contains an integer that specifies the support offset for Scaling.

Joff

On output, contains an integer that specifies the support offset for Wavelet.


Note
If none of the above arguments are present then the function will simply return the Result structure using the default Order.

Keywords

None.

Reference

Coefficients are from Daubechies, I., 1992: Ten Lectures on Wavelets, SIAM, p. 261. Note that Daubechies has divided by Sqrt(2), and the coefficients are reversed.

Version History

5.3
Introduced

See Also

WV_DWT, WV_FN_DAUBECHIES, WV_FN_HAAR, WV_FN_SYMLET

  IDL Online Help (March 06, 2007)