Fitting 3-d plot
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Tim Fulcher
le 27 Août 2023
Commenté : Tim Fulcher
le 27 Août 2023
Hi all,
I've been plotting a surface plot using surf(x, y, z) where x is a 1 x 8 double, y is a 1 x 11 double and z is an 11 x 8 double and fitting that surface using cftool with no issues. I now need to change my approach slightly and perform the fit programatically (as opposed to using cftool).
However surffit = fit([x,y],z,'poly32','normalize','on') does not accept my current format. How I can I adjust or massage my raw data (x, y and z) for surffit to accept it?
Thanks
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the cyclist
le 27 Août 2023
x = 1:8;
y = 1:11;
z = rand(11,8);
[xx,yy] = meshgrid(x,y);
surf(xx,yy,z)
3 commentaires
the cyclist
le 27 Août 2023
Sorry, I should have mentioned that the surface fitting function requires you to turn all those matrices into vector again. The key concept being that all the vectors need to be the same length, and specify a series of (x,y,z) coordinates.
You should double-check that my syntax really put the correct z with the corresponding (x,y). It's easy to get the (x,y) swapped.
x = 1:8;
y = 1:11;
z = rand(11,8);
[xx,yy] = meshgrid(x,y);
surf(xx,yy,z)
surffit = fit([xx(:), yy(:)], z(:), 'poly32', 'normalize', 'on')
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