The filtfilt(d, x) version in the documentation does not seem to work

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Dan 2018-9-7

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https://ww2.mathworks.cn/matlabcentral/answers/418093-the-filtfilt-d-x-version-in-the-documentation-does-not-seem-to-work

回答： Dan 2018-9-14

The filtfilt() function seems to demand 3 inputs (b, a, x) but the documentation says it can also accept a filter object instead of the b,a coefficients. Is this an error in the documentation or in the filtfilt() function itself?

Thanks, Dan

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Answer 1

Dan 2018-9-14

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https://ww2.mathworks.cn/matlabcentral/answers/418093-the-filtfilt-d-x-version-in-the-documentation-does-not-seem-to-work#answer_336838

It appears that filtfilt does not accept any and all dsp toolbox filter objects. I just happened to choose one that it does not accept. When that happens it reverts to the filtfilt.m file that expects 3 arguments so you get an unhelpful error message complaining about insufficient number of arguments.

So my question has been answered.