wavsupport

Wavelet support

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    Syntax

    [LB,UB] = wavsupport(wname)
    B = wavsupport(wname)

    Description

    [LB,UB] = wavsupport(wname) returns the lower bound, LB, and upper bound, UB, of the support for the wavelet specified by wname.

    example

    B = wavsupport(wname) returns the lower and upper bounds of the support of the wavelet.

    Examples

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    Open Live Script

    Return the lower bound and upper bound of the support for the Haar wavelet.

    [LB,UB] = wavsupport('haar')
    LB = 
-0.5000

    UB = 
0.5000

    The length of the Haar wavelet filter is 2. Compare LB and UB to the lower and upper bounds for orthogonal and biorthogonal wavelets (type 1 and type 2).

    LF = 2;
LowerBound = -0.5*(LF-1)
    LowerBound = 
-0.5000

    UpperBound = 0.5*(LF-1)
    UpperBound = 
0.5000
    Open Live Script

    Return the lower bound and upper bound of the support for the complex-valued Gaussian wavelet.

    [LB,UB] = wavsupport("cgau3")
    LB = 
-5

    UB = 
5

    Input Arguments

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    Wavelet, specified by a character vector or string scalar. The wavelet must be recognized by wavemngr.

    Example: "db4"

    Data Types: char | string

    Output Arguments

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    Wavelet support, returned as scalars. LB and UB are the lower and upper bounds, respectively, of the support.

    • For real-valued wavelets with and without scaling functions and complex-valued wavelets without scaling functions (wavelets type 3,4, and 5), the bounds indicate the effective support of the wavelet.

    • For orthogonal and biorthogonal wavelets (type 1 and type 2 respectively), the lower and upper bounds are LB = -0.5*(LF-1) and UB = 0.5*(LF-1), where LF is the length of the wavelet filter.

    Data Types: double

    Support of the wavelet, returned as a vector: B = [LB,UB].

    Data Types: double

    Version History

    Introduced in R2010b

    See Also