How to divide a signal to a function?

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Fatemeh Sharafi
Fatemeh Sharafi 2021-7-13
评论： Fatemeh Sharafi 2021-7-13
Hi dear friends. I have a nonstationary signal and I want to divide it to a 4-order polynomial function. but the result doesn't seem correct:
I simply do it like :
w= signal./function
Here's the signal plot:
this is the function:
and the result (when I divide them) is this:
I don't know what that big peak is? Logcally it shouldn't seem like this and should be like a stationary signal
I would be so garteful if you guide me

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Chunru
Chunru 2021-7-13
The "function" has a value close to 0 and thus division by 0 (or small value) results in the big peak.
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Chunru
Chunru 2021-7-13
It depends on what you want to do, which you did not explain clearly. Anyway you should always avoid the division by zero. You many consider the following:
w= signal./ (f+0.5); % don't use function as variable name
Fatemeh Sharafi
Fatemeh Sharafi 2021-7-13
this function was obtained from curve fitting the 4th-order polynomial func to a non-statinary signal. Then I used the fit function to convert the nonstationary signal to stationary by divide them.
thanks by the way. Your help was perfect

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