How can I fit a curve at the bottom of the plot below?
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I have the attached dataset and I want to fit a curve at the bottom of the curve. See the attached photo. The original data is in blue and the fit is that in black.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1425948/image.png)
Sample data is attached. Thank you in advance
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Matt J
le 4 Juil 2023
Modifié(e) : Matt J
le 4 Juil 2023
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Matt J
le 4 Juil 2023
Ok, but what help do you still require? As you can see below, the recommendations from my last comment work for y.txt as well.
[~,y]=readvars('y.txt');
x=(1:numel(y))';
S=[1,0.7,0];
for s=S
k=boundary(x([1:end,1]), y([1:end,1]),s);
k=k(diff(k)>0);
plot(x(k),y(k),'-.');hold on
end;
legend("s="+S); xlim([100,400])
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