Connecting Data points in a smooth curve
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How can I connect 2D data points in a smooth curve given that I can't use spline because it requires my x elements to be unique?
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Akira Agata
2018-7-20
You can do this task by applying the method used in the 2nd example in spline function help page.
The following is an example:
% Your data
x = [2 4 5 2 8 5];
y = [15 6 17 28 90 80];
% Cubic spline data interpolation
t = 1:numel(x);
xy = [x;y];
pp = spline(t,xy);
tInterp = linspace(1,numel(x));
xyInterp = ppval(pp, tInterp);
% Show the result
figure
plot(x,y,'o:')
hold on
plot(xyInterp(1,:),xyInterp(2,:))
legend({'Original data','Spline interpolation'},'FontSize',12)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/192256/image.png)
2 个评论
Image Analyst
2018-7-22
This looks like a 1-D situation, not a 2-D situation. You have one input/independent/x value, and one output/dependent/y value for each input value. That's 1-D, even if they can be plotted in an x-y plane.
Attach your data, and show exactly what you'd like as the output. Maybe you just want interp1() but you just have to average the values that don't have unique x values. Or else add a tiny bit of noise to the x values to separate them.
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