Re: Some questions about LTFAT wavelets

[Alasdair McAndrew]

Many thanks!  The output of "pkg list" is

Package Name  | Version | Installation directory
--------------+---------+-----------------------
     control *|   2.6.6 | /usr/share/octave/packages/control-2.6.6
     general *|   1.3.4 | /usr/share/octave/packages/general-1.3.4
       image *|   2.2.2 | /usr/share/octave/packages/image-2.2.2
          io *|   2.2.4 | /usr/share/octave/packages/io-2.2.4
       ltfat *|   2.0.1 | /usr/share/octave/packages/ltfat-2.0.1
      signal *|   1.3.0 | /usr/share/octave/packages/signal-1.3.0
     specfun *|   1.1.0 | /usr/share/octave/packages/specfun-1.1.0
  statistics *|   1.2.3 | /usr/share/octave/packages/statistics-1.2.3

I am hoping to use wavelets for image processing, so I do need some of these other packages.  However, if I start octave (version 3.8.1), under linux (Ubuntu 14.04 64 bit) with

octave --no-init-file

and then enter the commands

pkg load ltfat
wfiltinfo('db2')

the same errors as before are produced.  I've even tried starting octave in a different directory, to ensure it's not picking up anything from some of my own programs.  I suppose I could upgrade octave to 3.8.2... Anyway, thanks again!

-Alasdair

On Tue, Jan 20, 2015 at 9:34 PM, <address@hidden> wrote:

> In attempting to find an implementation of the fast wavelet transform, I
> downloaded and installed the LTFAT package, which has what looks to be a
> fairly full-featured wavelets module.
>
>    1. Without going through all the wfilt_* functions, is there a list of
>    all the wavelets and wavelet families supported by LTFAT?
The best place to look is probably just the overview of the Contents file:

http://ltfat.sourceforge.net/doc/wavelets/index.php

here you can see a list of all of them.
>
>    2. On some wavelets, wfiltinfo produces errors.  For example:
>    wfiltinfo('dden5') gives a nice figure full of graphs, but
> wfiltinfo('db4')
>    produces one graph, and then:
>
>    error: cellfun: dimensions mismatch
>    error: called from:
>    error:   /usr/share/octave/3.8.1/m/plot/appearance/axis.m at line 348,
>    column 14
>    error:   /usr/share/octave/3.8.1/m/plot/appearance/axis.m at line 374,
>    column 8
>    error:   /usr/share/octave/3.8.1/m/plot/appearance/axis.m at line 231,
>    column 7
>    error:   /usr/share/octave/3.8.1/m/plot/appearance/axis.m at line 149,
>    column 7
>    error:   /usr/share/octave/packages/ltfat-2.0.1/wavelets/wfiltinfo.m at
>    line 81, column 1
>
>    What's going on here, and how do I overcome it?

Hmm... I can't reproduce it. Which operating system are you using? Have
you installed any other wavelet toolboxes? Perhaps there is a name clash
with some external function.

Cheers,
Peter.

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