freqz produces incorrect output

[Søren Hauberg]

lør, 24 01 2009 kl. 19:57 -0500, skrev Ben Abbott:
> I look at a simple example.
> 
> 	freqz (ones (20, 1), 1, 512, "half", 2)

I've never used this function before, so I don't know how it's supposed
to work, but I can compare with Matlab. I've posted the result of this
code at http://hauberg.org/freqz

> In the event, the problem is with FIR lengths > 512, I tried
> 
> 	freqz (postpad (ones (20, 1), 768), 1, 512, "half", 2);

> 	freqz (prepad (ones (20, 1), 768), 1, 512, "half", 2);
> 

Unfortunately, I cannot run this code in Matlab as it doesn't have
'postpad' and 'prepad'.

Søren