I'm using MATLAB 2008, and I have looked at some tutorials online about a Butterworth filter. Does MATLAB 2008 have this function?

It does not seem to have it since I typed 'help butter' into the command window and it said function not found. Is there another way to use a butterworth filter in 2008 rather than get a new version of MATLAB?

Answer 1

[Thomas]

The Butterworth IIR filter design using specification object function 'butter' is not part of MATLAB core but the Signal processing toolbox (IF I remember it right)

You need to have the toolbox to use the ver function

 >> ver

to see what toolboxes you have installed.

If you have the signal processing toolbox then you might want to see if it can find the function

 >> which butter