wavemngr

Wavelet manager

Syntax

wavemngr('add',FN,FSN,WT,NUMS,FILE)

wavemngr('add',FN,FSN,WT,{NUMS,TYPNUMS},FILE)

wavemngr(___,B)

wavemngr('del',N)

wavemngr('restore')

wavemngr('restore',IN2)

out = wavemngr('read')

out = wavemngr('read',IN2)

out = wavemngr('read_asc')

wavetype = wavemngr('type',wname)

Description

Use wavemngr to add, delete, restore, or read wavelets.

wavemngr('add',FN,FSN,WT,NUMS,FILE) adds a wavelet family to the toolbox. These parameters define the wavelet family:

• FN — Family name

• FSN — Family short name

• WT — Wavelet family type

• NUMS — Wavelet parameters

• FILE — Wavelet definition file

Note

When you use wavemngr to add a wavelet family, three wavelet extension files are created in the current folder: the two ASCII files wavelets.asc and wavelets.prv, and the MAT-file wavelets.inf. If you add a new wavelet family, it is available in this folder only.

wavemngr('add',FN,FSN,WT,{NUMS,TYPNUMS},FILE) adds a wavelet family with parameter NUMS with input format type TYPNUMS.

wavemngr(___,B) adds a wavelet family, where B specifies the effective support for the wavelets. The B input argument is valid only for wavelets of type WT = 3, 4, and 5. You can use this syntax with any of the previous syntaxes.

wavemngr('del',N) deletes the wavelet or wavelet family specified by N.

wavemngr('restore') restores the previous wavelets.asc ASCII file

wavemngr('restore',IN2) restores the initial wavelets.asc ASCII file. Here IN2 is a dummy argument.

out = wavemngr('read') returns all wavelet family names in a character array.

out = wavemngr('read',IN2) returns all wavelet names in a character array. Here IN2 is a dummy argument.

out = wavemngr('read_asc') reads the wavelets.asc ASCII file and returns all wavelet information.

wavetype = wavemngr('type',wname) returns the family type of the wavelet wname.

Examples

Wavelet Names and Family Names

List the wavelet families available by default.

wavemngr('read')

ans = 23×35 char array
    '==================================='
    'Haar                     →→haar    '
    'Daubechies               →→db      '
    'Symlets                  →→sym     '
    'Coiflets                 →→coif    '
    'BiorSplines              →→bior    '
    'ReverseBior              →→rbio    '
    'Meyer                    →→meyr    '
    'DMeyer                   →→dmey    '
    'Gaussian                 →→gaus    '
    'Mexican_hat              →→mexh    '
    'Morlet                   →→morl    '
    'Complex Gaussian         →→cgau    '
    'Shannon                  →→shan    '
    'Frequency B-Spline       →→fbsp    '
    'Complex Morlet           →→cmor    '
    'Fejer-Korovkin           →→fk      '
    'Best-localized Daubechies→→bl      '
    'Morris minimum-bandwidth →→mb      '
    'Beylkin                  →→beyl    '
    'Vaidyanathan             →→vaid    '
    'Han linear-phase moments →→han     '
    '==================================='

List all wavelets.

wavemngr('read',1)

ans = 89×44 char array
    '===================================         '
    'Haar                     →→haar             '
    '===================================         '
    'Daubechies               →→db               '
    '------------------------------              '
    'db1→db2→db3→db4→                            '
    'db5→db6→db7→db8→                            '
    'db9→db10→db**→                              '
    '===================================         '
    'Symlets                  →→sym              '
    '------------------------------              '
    'sym2→sym3→sym4→sym5→                        '
    'sym6→sym7→sym8→sym**→                       '
    '===================================         '
    'Coiflets                 →→coif             '
    '------------------------------              '
    'coif1→coif2→coif3→coif4→                    '
    'coif5→                                      '
    '===================================         '
    'BiorSplines              →→bior             '
    '------------------------------              '
    'bior1.1→bior1.3→bior1.5→bior2.2→            '
    'bior2.4→bior2.6→bior2.8→bior3.1→            '
    'bior3.3→bior3.5→bior3.7→bior3.9→            '
    'bior4.4→bior5.5→bior6.8→                    '
    '===================================         '
    'ReverseBior              →→rbio             '
    '------------------------------              '
    'rbio1.1→rbio1.3→rbio1.5→rbio2.2→            '
    'rbio2.4→rbio2.6→rbio2.8→rbio3.1→            '
    'rbio3.3→rbio3.5→rbio3.7→rbio3.9→            '
    'rbio4.4→rbio5.5→rbio6.8→                    '
    '===================================         '
    'Meyer                    →→meyr             '
    '===================================         '
    'DMeyer                   →→dmey             '
    '===================================         '
    'Gaussian                 →→gaus             '
    '------------------------------              '
    'gaus1→gaus2→gaus3→gaus4→                    '
    'gaus5→gaus6→gaus7→gaus8→                    '
    '===================================         '
    'Mexican_hat              →→mexh             '
    '===================================         '
    'Morlet                   →→morl             '
    '===================================         '
    'Complex Gaussian         →→cgau             '
    '------------------------------              '
    'cgau1→cgau2→cgau3→cgau4→                    '
    'cgau5→cgau6→cgau7→cgau8→                    '
    '===================================         '
    'Shannon                  →→shan             '
    '------------------------------              '
    'shan1-1.5→shan1-1→shan1-0.5→shan1-0.1→      '
    'shan2-3→shan**→                             '
    '===================================         '
    'Frequency B-Spline       →→fbsp             '
    '------------------------------              '
    'fbsp1-1-1.5→fbsp1-1-1→fbsp1-1-0.5→fbsp2-1-1→'
    'fbsp2-1-0.5→fbsp2-1-0.1→fbsp**→             '
    '===================================         '
    'Complex Morlet           →→cmor             '
    '------------------------------              '
    'cmor1-1.5→cmor1-1→cmor1-0.5→cmor1-1→        '
    'cmor1-0.5→cmor1-0.1→cmor**→                 '
    '===================================         '
    'Fejer-Korovkin           →→fk               '
    '------------------------------              '
    'fk4→fk6→fk8→fk14→                           '
    'fk18→fk22→                                  '
    '===================================         '
    'Best-localized Daubechies→→bl               '
    '------------------------------              '
    'bl7→bl9→bl10→                               '
    '===================================         '
    'Morris minimum-bandwidth →→mb               '
    '------------------------------              '
    'mb4.2→mb8.2→mb8.3→mb8.4→                    '
    'mb10.3→mb12.3→mb14.3→mb16.3→                '
    'mb18.3→mb24.3→mb32.3→                       '
    '===================================         '
    'Beylkin                  →→beyl             '
    '===================================         '
    'Vaidyanathan             →→vaid             '
    '===================================         '
    'Han linear-phase moments →→han              '
    '------------------------------              '
    'han2.3→han3.3→han4.5→han5.5→                '
    '===================================         '

Add Wavelet Families

This example shows how to add new compactly supported orthogonal wavelets to the toolbox. These wavelets, which are a slight generalization of the Daubechies wavelets, are based on the use of Bernstein polynomials and are due to Kateb and Lemarié.

Add a new family of orthogonal wavelets. You must define:

• Family Name: Lemarie

• Family Short Name: lem

• Type of wavelet: 1 (orth)

• Wavelet numbers: 1 2 3 4 5

• File driver: lemwavf

The source code for lemwavf.m is in the same folder as this example. The input argument of lemwavf is a character vector of the form lemN, where N = 1, 2, 3, 4, or 5.

wavemngr('add','Lemarie','lem',1,'1 2 3 4 5','lemwavf')

The ASCII file wavelets.asc is saved as wavelets.prv, then information defining the new family is added to wavelets.asc, and the MAT-file wavelets.inf is generated.

Note that wavemngr works on the current folder. If you add a new wavelet family, it is available in this folder only.

List the available wavelet families. Confirm the new wavelet family is added.

wavemngr('read')

ans = 24×35 char array
    '==================================='
    'Haar                     →→haar    '
    'Daubechies               →→db      '
    'Symlets                  →→sym     '
    'Coiflets                 →→coif    '
    'BiorSplines              →→bior    '
    'ReverseBior              →→rbio    '
    'Meyer                    →→meyr    '
    'DMeyer                   →→dmey    '
    'Gaussian                 →→gaus    '
    'Mexican_hat              →→mexh    '
    'Morlet                   →→morl    '
    'Complex Gaussian         →→cgau    '
    'Shannon                  →→shan    '
    'Frequency B-Spline       →→fbsp    '
    'Complex Morlet           →→cmor    '
    'Fejer-Korovkin           →→fk      '
    'Best-localized Daubechies→→bl      '
    'Morris minimum-bandwidth →→mb      '
    'Beylkin                  →→beyl    '
    'Vaidyanathan             →→vaid    '
    'Han linear-phase moments →→han     '
    'Lemarie                  →→lem     '
    '==================================='

Remove the added family. Regenerate the list of wavelet families.

wavemngr('del','Lemarie')
wavemngr('read')

ans = 23×35 char array
    '==================================='
    'Haar                     →→haar    '
    'Daubechies               →→db      '
    'Symlets                  →→sym     '
    'Coiflets                 →→coif    '
    'BiorSplines              →→bior    '
    'ReverseBior              →→rbio    '
    'Meyer                    →→meyr    '
    'DMeyer                   →→dmey    '
    'Gaussian                 →→gaus    '
    'Mexican_hat              →→mexh    '
    'Morlet                   →→morl    '
    'Complex Gaussian         →→cgau    '
    'Shannon                  →→shan    '
    'Frequency B-Spline       →→fbsp    '
    'Complex Morlet           →→cmor    '
    'Fejer-Korovkin           →→fk      '
    'Best-localized Daubechies→→bl      '
    'Morris minimum-bandwidth →→mb      '
    'Beylkin                  →→beyl    '
    'Vaidyanathan             →→vaid    '
    'Han linear-phase moments →→han     '
    '==================================='

Restore the previous ASCII file wavelets.prv, then build the MAT-file wavelets.inf. List the restored wavelets. Because wavemngr reads the ASCII file in the current working directory, the new family appears in the list.

wavemngr('restore')
wavemngr('read',1)

ans = 94×44 char array
    '===================================         '
    'Haar                     →→haar             '
    '===================================         '
    'Daubechies               →→db               '
    '------------------------------              '
    'db1→db2→db3→db4→                            '
    'db5→db6→db7→db8→                            '
    'db9→db10→db**→                              '
    '===================================         '
    'Symlets                  →→sym              '
    '------------------------------              '
    'sym2→sym3→sym4→sym5→                        '
    'sym6→sym7→sym8→sym**→                       '
    '===================================         '
    'Coiflets                 →→coif             '
    '------------------------------              '
    'coif1→coif2→coif3→coif4→                    '
    'coif5→                                      '
    '===================================         '
    'BiorSplines              →→bior             '
    '------------------------------              '
    'bior1.1→bior1.3→bior1.5→bior2.2→            '
    'bior2.4→bior2.6→bior2.8→bior3.1→            '
    'bior3.3→bior3.5→bior3.7→bior3.9→            '
    'bior4.4→bior5.5→bior6.8→                    '
    '===================================         '
    'ReverseBior              →→rbio             '
    '------------------------------              '
    'rbio1.1→rbio1.3→rbio1.5→rbio2.2→            '
    'rbio2.4→rbio2.6→rbio2.8→rbio3.1→            '
    'rbio3.3→rbio3.5→rbio3.7→rbio3.9→            '
    'rbio4.4→rbio5.5→rbio6.8→                    '
    '===================================         '
    'Meyer                    →→meyr             '
    '===================================         '
    'DMeyer                   →→dmey             '
    '===================================         '
    'Gaussian                 →→gaus             '
    '------------------------------              '
    'gaus1→gaus2→gaus3→gaus4→                    '
    'gaus5→gaus6→gaus7→gaus8→                    '
    '===================================         '
    'Mexican_hat              →→mexh             '
    '===================================         '
    'Morlet                   →→morl             '
    '===================================         '
    'Complex Gaussian         →→cgau             '
    '------------------------------              '
    'cgau1→cgau2→cgau3→cgau4→                    '
    'cgau5→cgau6→cgau7→cgau8→                    '
    '===================================         '
    'Shannon                  →→shan             '
    '------------------------------              '
    'shan1-1.5→shan1-1→shan1-0.5→shan1-0.1→      '
    'shan2-3→shan**→                             '
    '===================================         '
    'Frequency B-Spline       →→fbsp             '
    '------------------------------              '
    'fbsp1-1-1.5→fbsp1-1-1→fbsp1-1-0.5→fbsp2-1-1→'
    'fbsp2-1-0.5→fbsp2-1-0.1→fbsp**→             '
    '===================================         '
    'Complex Morlet           →→cmor             '
    '------------------------------              '
    'cmor1-1.5→cmor1-1→cmor1-0.5→cmor1-1→        '
    'cmor1-0.5→cmor1-0.1→cmor**→                 '
    '===================================         '
    'Fejer-Korovkin           →→fk               '
    '------------------------------              '
    'fk4→fk6→fk8→fk14→                           '
    'fk18→fk22→                                  '
    '===================================         '
    'Best-localized Daubechies→→bl               '
    '------------------------------              '
    'bl7→bl9→bl10→                               '
    '===================================         '
    'Morris minimum-bandwidth →→mb               '
    '------------------------------              '
    'mb4.2→mb8.2→mb8.3→mb8.4→                    '
    'mb10.3→mb12.3→mb14.3→mb16.3→                '
    'mb18.3→mb24.3→mb32.3→                       '
    '===================================         '
    'Beylkin                  →→beyl             '
    '===================================         '
    'Vaidyanathan             →→vaid             '
    '===================================         '
    'Han linear-phase moments →→han              '
    '------------------------------              '
    'han2.3→han3.3→han4.5→han5.5→                '
    '===================================         '
    'Lemarie                  →→lem              '
    '------------------------------              '
    'lem1→lem2→lem3→lem4→                        '
    'lem5→                                       '
    '===================================         '

Restore the initial wavelets. Restore the initial ASCII file wavelets.ini and the initial MAT-file wavelets.bin. Regenerate the list of wavelet families. The list does not include the new family.

wavemngr('restore',0)
wavemngr('read')

ans = 23×35 char array
    '==================================='
    'Haar                     →→haar    '
    'Daubechies               →→db      '
    'Symlets                  →→sym     '
    'Coiflets                 →→coif    '
    'BiorSplines              →→bior    '
    'ReverseBior              →→rbio    '
    'Meyer                    →→meyr    '
    'DMeyer                   →→dmey    '
    'Gaussian                 →→gaus    '
    'Mexican_hat              →→mexh    '
    'Morlet                   →→morl    '
    'Complex Gaussian         →→cgau    '
    'Shannon                  →→shan    '
    'Frequency B-Spline       →→fbsp    '
    'Complex Morlet           →→cmor    '
    'Fejer-Korovkin           →→fk      '
    'Best-localized Daubechies→→bl      '
    'Morris minimum-bandwidth →→mb      '
    'Beylkin                  →→beyl    '
    'Vaidyanathan             →→vaid    '
    'Han linear-phase moments →→han     '
    '==================================='

All command line capabilities are available for new families of wavelets. Create a new family. Compute the four associated filters and the scale and wavelet functions.

wavemngr('add','Lemarie','lem',1,'1 2 3 4 5','lemwavf');
[Lo_D,Hi_D,Lo_R,Hi_R] = wfilters('lem3');
[phi,psi,xval] = wavefun('lem3');
plot(xval,[phi;psi]);
legend('Scaling Function','Wavelet')
grid on

Remove the added family.

wavemngr('del','Lemarie')

Input Arguments

FN — Wavelet family name

character vector | string scalar

Wavelet family name, specified as a character vector or string scalar.

FSN — Wavelet family short name

character vector | string scalar

Wavelet family short name, specified as a character vector or string scalar. The number of characters in FSN must be less than or equal to 4.

WT — Wavelet family type

1 | 2 | 3 | 4 | 5

Wavelet family type, specified as one of the following:

• 1 — Orthogonal wavelets

• 2 — Biorthogonal wavelets

• 3 — Wavelet with a scaling function

• 4 — Wavelet without a scaling function

• 5 — Complex wavelet without a scaling function

NUMS — Wavelet parameters

'' | character vector | string scalar

Wavelet parameters, specified as:

• If the family consists of a single wavelet, NUMS is the empty string ''. For example, the mexh and morl families each contain a single wavelet.

• If the wavelet is member of a finite family of wavelets, NUMS contains a space-separated list of items representing wavelet parameters. For example, for the biorthogonal wavelet family bior, NUMS = '1.1 1.3 1.5 2.2 2.4 2.6 2.8 3.1 3.3 3.5 3.7 3.9 4.4 5.5 6.8'.

• If the wavelet is member of an infinite family of wavelets, NUMS contains a space-separated list of items representing wavelet parameters, terminated by the special sequence **. Two examples are listed in the following table.

  Wavelet Family	NUMS
  db	NUMS = '1 2 3 4 5 6 7 8 9 10 **'
  shan	NUMS = '1-1.5 1-1 1-0.5 1-0.1 2-3 **'

TYPNUMS — Wavelet parameter input format

'integer' (default) | 'real' | 'charactervector'

Wavelet parameter input format, specified as:

• 'integer' — Use this option when the parameter is an integer. For example, the Daubechies wavelet family db uses an integer parameter.

• 'real' — Use this option when the parameter is real. For example, the biorthogonal wavelet family bior uses a real parameter.

• 'charactervector' — Use this option when the parameter is a character vector. For example, the Shannon wavelet family uses a character vector.

FILE — Wavelet definition file

character vector | string scalar

Wavelet definition file, specified as a character vector or string scalar. FILE is the name of a MAT-file or a code file name that defines the wavelet family.

If the wavelet family contains only one type 1 (orthogonal) or type 2 (biorthogonal) wavelet, you can define the wavelet in a MAT-file. The MAT-file contains the scaling filter coefficients. The filename must match the wavelet family short name.

• If you define an orthogonal wavelet in a MAT-file, the name of the variable containing the scaling filter coefficients must match the name of the wavelet family short name.

• If you define a biorthogonal wavelet in a MAT-file, the names of the variables containing the scaling filter coefficients must be Df and Rf.

For more information, see Add Quadrature Mirror and Biorthogonal Wavelet Filters.

Example: If a family that contains a single orthogonal wavelet has the short name wfsn, the variable wfsn must contain the scaling filter coefficients. To create the necessary MAT-file, you would use the command save wfsn wfsn.

B — Effective support

two-element real-valued vector

Effective support for wavelets with family type WT equal to 3, 4, or 5, specified as a two-element real-valued vector. If B = [lb ub], then lb specifies the lower bound, and ub specifies the upper bound.

Data Types: double

N — Wavelet

character vector | string scalar

Wavelet or wavelet family to delete, specified by a character vector or string scalar. N is either the wavelet name or wavelet family short name.

Example: wavemngr('del','Lemarie')

wname — Wavelet

character vector | string scalar

Wavelet, specified as a character vector or string scalar. To learn what wavelets are available in a wavelet family, use waveinfo and the family short name.

Example: ty = wavemngr('type',"coif4")

Output Arguments

out — Wavelet manager output

character array

Wavelet manager output, returned as a character array.

wavetype — Wavelet family type

integer

Wavelet family type, returned as an integer.

• 1 — Orthogonal wavelets

• 2 — Biorthogonal wavelets

• 3 — Wavelet with a scaling function

• 4 — Wavelet without a scaling function

• 5 — Complex wavelet without a scaling function

Limitations

• wavemngr allows you to add a wavelet. You must verify that it is truly a wavelet. No check is performed to confirm the addition is a wavelet or to confirm the type of the new wavelet. You can use isorthwfb and isbiorthwfb to determine if a wavelet is orthogonal or biorthogonal.

References

[1] Daubechies, I. Ten Lectures on Wavelets. CBMS-NSF Regional Conference Series in Applied Mathematics. Philadelphia, PA: Society for Industrial and Applied Mathematics, 1992.

Version History

Introduced before R2006a