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Symlet wavelet filter computation

The `symaux`

function generates the scaling filter coefficients
for the "least asymmetric" Daubechies wavelets.

`w = symaux(n)`

`w = symaux(___,sumw)`

is the
order `w`

= symaux(`n`

)`n`

Symlet scaling filter such that ```
sum(w) =
1
```

.

Instability may occur when

`n`

is too large. Starting with values of`n`

in the 30s range, function output will no longer accurately represent scaling filter coefficients.As

`n`

increases, the time required to compute the filter coefficients rapidly grows.

[1] Daubechies, I. (1992),
*Ten Lectures on Wavelets*, CBMS-NSF conference series in applied
mathematics, SIAM Ed.

[2] Oppenheim, Alan V., and Ronald W.
Schafer. *Discrete-Time Signal Processing*. Englewood Cliffs, NJ:
Prentice Hall, 1989.

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