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# rbiowavf

Reverse biorthogonal spline wavelet filters

## Syntax

```[RF,DF] = rbiowavf(W) ```

## Description

`[RF,DF] = rbiowavf(W)` returns the two scaling filters associated with the biorthogonal wavelet specified by the character vector `W`.

`W = 'rbioNd.Nr'` where possible values for `Nd` and `Nr` are

 `Nd = 1 ` `Nr = 1 , 3 or 5 ` `Nd = 2 ` `Nr = 2 , 4 , 6 or 8` `Nd = 3` `Nr = 1 , 3 , 5 , 7 or 9` `Nd = 4 ` `Nr = 4 ` `Nd = 5 ` `Nr = 5 ` `Nd = 6 ` `Nr = 8`

The output arguments are filters.

• `RF` is the reconstruction filter.

• `DF` is the decomposition filter.

## Examples

collapse all

Obtain the reverse biorthogonal reconstruction and decomposition scaling filters for the `'rbio3.1'` wavelet. The `'rbio3.1'` wavelet has 3 vanishing moments for the decomposition (analysis) wavelet and 1 vanishing moment for the reconstruction (synthesis) wavelet.

`[RF,DF] = rbiowavf('rbio3.1');`

The reconstruction scaling filter, `RF`, and the decomposition filter, `DF`, are equal to the filters returned by `wfilters` scaled by .

```[LoD,HiD,LoR,HiR] = wfilters('rbio3.1'); max(abs(sqrt(2)*DF-LoD))```
```ans = 0 ```
`max(abs(sqrt(2)*RF-LoR))`
```ans = 0 ```

## See Also

#### Introduced before R2006a

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