How to get curve fitting equation
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Abdallah Magour
on 23 Jan 2024
Commented: Abdallah Magour
on 24 Jan 2024
Is there a way I can get the equation shwon in the figure or in the basic fitting window? The 8th degree polynimial.
I want to get this equation through a code line not through the graph tools, I also need it in the exact same form.(Including x)
I will repeiat this for a large number of plots or x and y data directly if possible.
Please ignore the red line at the bottom.![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1598156/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1598156/image.png)
2 Comments
akshatsood
on 23 Jan 2024
Edited: akshatsood
on 23 Jan 2024
Could you please provide me with the data needed to replicate the issue on my end, allowing me to assist you better?
Accepted Answer
Walter Roberson
on 23 Jan 2024
Edited: Walter Roberson
on 23 Jan 2024
6 Comments
Sam Chak
on 24 Jan 2024
The data is not the same as what is shown in the image above. However, you can remove the NaN values by utilizing the isnan() function.
T = readtable("Data from a similar graph.xlsx", VariableNamingRule="preserve")
x = T{:,1};
y = T{:,2}; % contains NaN
data= [x, y];
%% Omit row contains NaN
data_clean = data(~isnan(data(:, 2)), :)
%% Extract from clean data
x_clean = data(:,1);
y_clean = data(:,2);
plot(x_clean, y_clean, '-o'), grid on
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