Butterworth filter design calls bilinear and fails
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Sam Kastner
il 19 Gen 2021
Commentato: Sam Kastner
il 22 Gen 2021
I am attempting to set up a simple low-pass Butterworth filter using the following line of code:
[b,a]=butter(2,1/8,'low');
This produces the following error(s):
Error using bilinear
Too many output arguments.
Error in butter>butterImpl (line 130)
[ad,bd,cd,dd] = bilinear(ad,bd,cd,dd,fs);
Error in butter (line 59)
[varargout{1:nargout}] = butterImpl(n,Wn,varargin{:});
As far as I can tell, this is a valid call of bilinear (i.e. five inputs, four outputs). Can anyone replicate this problem? I'm using R2020b Update 3 with the signal processing toolbox. I haven't changed the butter function at all.
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Mathieu NOE
il 20 Gen 2021
hi
it works on my R2020b Update 1
>> [b,a]=butter(2,1/8,'low');
>> b
b =
0.0300 0.0599 0.0300
>> a
a =
1.0000 -1.4542 0.5741
Risposta accettata
Adam Danz
il 20 Gen 2021
Modificato: Adam Danz
il 22 Gen 2021
You likely had another file on your Matlab path with the same name as butter. If the error happens again, the following command will show all functions and files of that name and will indicate which one you're using. Remove the path(s) to the functions that don't point to Matlab's butter() or rename the custom files/functions.
which butter -all
should point to \toolbox\signal\signal\butter.m (in r2020b).
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