Plot curve through data points

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Marcus Boyd
Marcus Boyd 2023-1-14
评论： Marcus Boyd 2023-1-14
Ran in:
Hi,
I am trying to plot a curve line through a set of points as showin in my drawing
I am using the following code to interpolate, but it is giving me the wrong graph.
x = [15.9, 16.9, 17.5, 19.6];
v = [1.108287307, 1.130052358, 1.118465615, 1.102750628];
xi = [x(1):0.0000001:x(end)];
vid=interp1(x,v,xi,'spline');
plot(x,v,'b*')
hold on
plot(xi,vid,'r')
Any help would be appreciated,
Thanks.

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采纳的回答

the cyclist
the cyclist 2023-1-14
Ran in:
You can use a different interpolation method. pchip looks like what you want:
x = [15.9, 16.9, 17.5, 19.6];
v = [1.108287307, 1.130052358, 1.118465615, 1.102750628];
xi = [x(1):0.0000001:x(end)];
vid=interp1(x,v,xi,'pchip');
figure
plot(x,v,'b*')
hold on
plot(xi,vid,'r')

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