As shown in the picture，how to fit discrete points to a closed curve?

Answer 1

[KSSV]

Your points are no tin an order....first make them into an order using boundary.

load data1.mat ; 
x = data1(:,1) ; y = data1(:,2) ; 
idx = boundary(x,y) ; 
x = x(idx) ; y(idx) ;
plot(x,y)

Hope the above one works, if you are okay with the above, you have your data into a polygon.

If not, you can have a look on, Beizer Curve. https://in.mathworks.com/matlabcentral/fileexchange/33828-generalised-bezier-curve-matlab-code

[Wesley]

Thank you very much for solving my problem in time. Your program is very helpful.