Fit a curve along points through starting and end point
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Stefan Lang
le 1 Oct 2020
Réponse apportée : Ameer Hamza
le 1 Oct 2020
I have some points with each an x and y value. I want to fit a curve somehow along these points, but not necessarily through these points. Except for the starting and endpoint, where the curve has to go through. The point curve looks a bit like sin/cos, so i think a fourier fit would work. How do i get to this, but with fixed start and endpoint?
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Ameer Hamza
le 1 Oct 2020
x = % your data points
y = % your data points
weights = [100 ones(1, numel(x)-2), 100]; % give a much higher weight to 1st and last point.
fit(x, y, 'sin8', 'Weights', weights);
sinx fittype series seems suitable for your data.
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KALYAN ACHARJYA
le 1 Oct 2020
Modifié(e) : KALYAN ACHARJYA
le 1 Oct 2020
You can fit the curve in number od ways, see which tyep perfectly fit as per your expectation
x_data=randi(10,[1,10])';
y_data=randi(10,[1,10])';
plot(x_data,y_data,'ro');
hold on
plot1=fit(x_data,y_data,'exp1');
%..........................^
plot(plot1,x_data,y_data);
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/369238/image.png)
Detail MATLAB docs here
If you just want connect the start point and end point only, plot the initail and end points of x and y data
x_data=randi(10,[1,10]);
y_data=randi(10,[1,10]);
plot(x_data,y_data,'ro');
hold on
plot(x_data([1,end]),y_data([1,end]));
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