The filtfilt function is different in different versions
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When I used filtfilt in version R2019b, I had to use input data in double format, but in version R2024, functions can recognize data in single format.But when I increased the order of the filter from second to third order, it became clear that the single format version produced the wrong result, and the result using the double version is still right.
I want to know why, please help me.
2 个评论
Infinite_king
2024-5-31
Can you provide the exact input values ?
Esther
2024-6-4
Can you share your code to reproduce the problem in 24a?
回答（1 个）
Abhiram
2025-2-21
0 个投票
Hi @中祥 范
When single-precision input is given, the filter coefficients of the ‘filtfilt’ function will be quantized to single precision.
The incorrect results with single precision data are especially evident when the filter order increases, as the numerical precision required exceeds what single precision can reliably provide.
Use of double-precision input can offer better stability and accuracy, which is crucial for higher-order filters.
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