MATLAB: Fit a 3d curve

Dear all,

I am a beginner in Matlab and I need your help. Here is my problem: I have a cloud of data obtained by measurement. Thanks to those datas I have made a matrix(49×49) which allowed me to plot a paraboloid. I would like to fit this 3d curve based on data, but I don't know how to start. Could you please help me to find a way to solve this problem?

Sincerely,

Elza

Best Answer

If you have the Curve Fitting Toolbox, you could try interactive surface fitting.

EDIT: If you don't have it, you could try polyfitn, which you can download from the File Exchange.

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f=@(x,y) [x+y^2-5; x+y-3];
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Does this help?

x = -1:0.01:1;
y = -1:0.01:1;
[xx,yy] = meshgrid(x,y);
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nsy = xx;
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figure
subplot(3,1,1),contour(xx,yy,nsx)
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subplot(3,1,3),contour(xx,yy,ss)

Best Answer

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MATLAB: Contour plot

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