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

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AS
AS 2020-9-30
回答： Asad (Mehrzad) Khoddam 2020-10-1
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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AS
AS 2020-10-1
I wanted to fit polynomial to see in which order it will fit.

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回答（1 个）

Asad (Mehrzad) Khoddam
try polyfit function:
polyfit function

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