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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')

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Honglei Chen
Honglei Chen il 20 Mar 2014
Modificato: Honglei Chen il 20 Mar 2014
What version are you using? It works fine for me in R2013b.
Dries billiet
Dries billiet il 24 Mar 2014
I am working with the R2012b.

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Chad Greene
Chad Greene il 20 Mar 2014
Modificato: Chad Greene il 20 Mar 2014

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

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Honglei Chen
Honglei Chen il 20 Mar 2014
What version are you using? It works fine for me in R2013b.
Chad Greene
Chad Greene il 20 Mar 2014
Interesting. I have R2012b.

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