In Matlab it's "semilogx()", "semilogy()", and "loglog()". I've never used
Octave, but I suspect that it's compatible.

Greg

On Mon, 14 Nov 2011 12:31:10 -0600, jungledmnc wrote:

> Hi,
> 
> I'm new to Matlab/Octave and I need a simple frequency response plot. I
> googled freqz & plot, but it shows the frequency on linear scale, for
> audio, which is my case, it is much more suitable to watch logarithmic
> scale. How to do that?

I assume you already have a transfer function in the z domain?

Search the help files for "bode".  I'm not sure how one does that in 
Octave (apropos?), but I'm almost certain that it'll cough up a Bode plot 
function name.

Chances are high that you can just type "help bode" and get what you want.

-- 
www.wescottdesign.com

Hi,

I'm new to Matlab/Octave and I need a simple frequency response plot. I
googled freqz & plot, but it shows the frequency on linear scale, for
audio, which is my case, it is much more suitable to watch logarithmic
scale. How to do that?

Thanks.
jungledmnc