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smooth curve smooth curve

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Latifa Bouguessaa
Latifa Bouguessaa 2022-11-17
回答： Star Strider 2022-11-17
Hello, everyone.
How can I best smooth the curve (see attachment) (fitting)? Do you have an idea?
I thank you
  2 个评论
Jan
Jan 2022-11-17
How do you define "good"? This must be specified before a "best" can be found. Do you want a low or high pass filtering? Or in other words: Are the low or the high frequencies the noise? "Fitting" is meaningful, if you know the function to fit from a physical model.
Latifa Bouguessaa
Latifa Bouguessaa 2022-11-17
I just need a function that smoothes the curve

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回答（1 个）

Star Strider
Star Strider 2022-11-17
That appears to me to be a fft result after using the fftshift function on it. Each of the ‘peaks’ is a different frequency component.
Experiment with zero-padding the fft:
L = numel(s);
NFFT = 2^nextpow2(L);
FTs = fft(s, NFFT)/L;
Here, ‘s’ is the original time-domain signal.
The frequency vector should go from -Fn to + Fn, where ‘Fn’ is the Nyquist frequency (one-half of the sampling frequency).
.

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