Plotting a smooth curve from points

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Muhammadhn Muhammadh Khalid
评论： Rajendra Gupta 2021-11-13
Hi there, I' m trying the same thing with the attached data set. But ending up in a more curvy plot. I need a smooth plot similar, but better than the attached figure. I tried the polyval funtion as shown here https://au.mathworks.com/matlabcentral/answers/500026-plotting-a-smooth-curve#answer_409817, but thats creating a more curvy plot. any help would be highly appreciated. Thanks
  1 个评论
Rajendra Gupta
Rajendra Gupta 2021-11-13
Try replacing 'spline with other options, such as 'cubic', also called 'pchip'. It resolved my problem.

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回答（1 个）

Marshall Dunlap
Marshall Dunlap 2020-3-4
With your values in MATLAB create a more well-defined vector of x values (xi). Use the interp1 function to implement a cubic spline interpolation. Then plot the orginial points and then the cubic spline interpolation.
x = [your values];
v = [your values];
xi = [x(1):0.0000001:x(end)];
vid=interp1(x,v,xi,'spline');
plot(x,v,'b*')
hold on
plot(xi,vid,'r')
  1 个评论
Rajendra Gupta
Rajendra Gupta 2021-11-12
This is the simplest smoothing code. Just two additional lines and you have a smooth plot. Good work.

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