>And what is meant by the message that contains predict and update, I
>know that with these parameters you get a haar wavelet, but what means
>predict and update which is also written as a console output (dwt:
>predict: [ -0.000120 .....update: [ -0.000060 )?

Predict and update mask are related with the filter coefficients of discrete wavelet tramsfrom, and you can specify the predict and update mask that you want to use in order to work with different kinds of wavelets (haar, interpolated of order n, ...).
Anyway, this external (dwt~) is based in lifting scheme, so you can take a look to this papers writed by Wim Sweldens to understand it better:

- http://cm.bell-labs.com/who/wim/papers/factor/index.html
- http://www.multires.caltech.edu/teaching/courses/waveletcourse/athome.pdf

More information about wavelets and lifting scheme is available in:

- http://cm.bell-labs.com/who/wim/
- http://www.multires.caltech.edu/teaching/courses/waveletcourse/

Tom Schouten have written this external, so he's the best person to help you.
I would like to receive more information about how this external works and about how to manipulate its output. So, please Tom, can you put more information about this external in this list?

Best regards,

Raul.