buttmag

Scilab Function
Last update : 12/01/2004

buttmag - response of Butterworth filter

### Calling Sequence

  `[h]=buttmag(order,omegac,sample)`

### Parameters

- `order`: integer : filter order
- `omegac`: real : cut-off frequency in Hertz
- `sample`: vector of frequency where `buttmag` is evaluated
- `h`: Butterworth filter values at sample points

### Description

squared magnitude response of a Butterworth filter `omegac` = cutoff frequency ; `sample` = sample of frequencies

### Examples

    //squared magnitude response of Butterworth filter
    h=buttmag(13,300,1:1000);
    mag=20*log(h)'/log(10);
    plot2d((1:1000)',mag,[2],"011"," ",[0,-180,1000,20])

### Author

F. D.