fault in matlab help?

Hello,

I am working on my thesis and I have to use a matlab filter for this. When I using the example on this page butter I tried the exact same filter. But mine was all but stable. How is this possible? Can somebody try this aswell? Thank you!

[z,p,k] = butter(9,300/500,'high');
sos = zp2sos(z,p,k);
fvtool(sos,'Analysis','freq')

[Honglei Chen]

What version are you using? It works fine for me in R2013b.

[Dries billiet]

I am working with the R2012b.

Answer 1

[Chad Greene]

Here's the result I get. Definitely does not match the documented example.

[Honglei Chen]

What version are you using? It works fine for me in R2013b.

[Chad Greene]

Interesting. I have R2012b.