how to fit a signal using polynomial fit with hogher order?

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I have a amplitude value with time period of a signal. I am trying to fit this signal by polynomial fitting. I have attached the amplitude vaueand written the code but it is not fitting. Is it possible to it using higher order of polynomial. I want to fit the curve using higher polynomial order (i.e. greater than 9) but it is not done. Please help me to solve this,
tt=0:2:3601;
tt=tt';
filename = 'value.xlsx';
A = xlsread(filename);
f1=fit(tt,A,'poly9');
plot(f1,tt,A);
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Answers (1)

Asad (Mehrzad) Khoddam
Asad (Mehrzad) Khoddam on 1 Oct 2020
try polyfit function:

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