Function "finite.m" is missing for butter!
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I don't understand why the Matlab "butter.m" function miss the function "finite.m" to work even if I've the signal treatment toolbox?
>> [B,A] = butter(2,[0.2 0.5])
Undefined function 'finite' for input arguments of type 'double'.
Error in zp2ss (line 45)
p = p(finite(p));
Error in butter (line 87)
[a,b,c,d] = zp2ss(z,p,k);
Thank you for your support
1 个评论
Fitra Hidiyanto
2019-5-22
try isfinite() instead of finite(), you can see on link : http://prefrontal.org/blog/2009/04/matlab-finite-function-warnings/
回答（1 个）
Andreas Goser
2013-12-12
0 个投票
This might happen in cases where there are multiple "finite" commands or variable names. Please use the "WHICH" command to identfy "finite" commands or variable names on the MATLAB path that cause this.
2 个评论
Vinc
2013-12-12
Andreas Goser
2013-12-12
编辑：Andreas Goser
2013-12-12
I see. I do not believe this is necessary. Point is you use a different release than I do (R2013a on Win64) and in my zp2ss file, there is no call to finite at all.
My suggestion:
Open butter.m and zp2ss.m in the editor and use breapoints to debug the code. Then you will be able to see what happens in the function.
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2019-5-22
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