🚀 go-pugleaf

On 15 apr, 19:49, Dirk Bell <bellda2...@cox.net> wrote:
> On Apr 14, 5:10 pm, Rune Allnor <all...@tele.ntnu.no> wrote:
>
>
>
>
>
> > On 14 apr, 23:04, Mariya <mariya.nago...@gmail.com> wrote:
>
> > > Hello:
>
> > > I have a 4x4 matrix which I wish to decompose into 4 frequency bands
> > > (LL, HL, LH, HH where L=low, H=high) by using a one-level Daubechies-4
> > > wavelet transform. As a result of the transform, each band should
> > > contain 2x2 coefficients. How can I do this in MATLAB? I know that
> > > MATLAB has dbaux and dbwavf functions. However, I'm not sure how to
> > > use them and I also don't have the wavelet toolbox.
>
> > Well, both those functions are from the wavelet toolbox,
> > so getting that toolbox would be an obvious starting point.
> > Once you get it, there is a chance that there is some
> > documentation included, which might help explain how to
> > use the functions...
>
> > Rune
>
> That is an expensive answer if it is gotten legitimately.

I've heard some rumours that matlab has some safety features
built in, such that a function name from a toolbox you do
not have a lisence for somehow gets blocked. I haven't tested
it - don't even know if it is true - but this seems to be a
'reasonable' countermeasure against pirate versions of useful
functions. (Although it would be a nuisance for somebody who
might want to write a function with a name that happens to be
taken by a toolbox function.)

So if the OP wants to use those functions mentioned, getting
the toolbox seems to be the only option.

> Cheaper solution, web search.

Or learning the material from scratch and implement yourself.
But that was, of course, what you meant...?

Rune