how to create a contour for a fittype object?

Question

Dany 2015-7-8

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/229034-how-to-create-a-contour-for-a-fittype-object

评论： Dany 2015-7-8

采纳的回答： Mike Garrity

在 MATLAB Online 中打开

Hi,

i've fitted a surface for a scattered data using the following commands:

 load('full_data.mat')
 ft = fittype( 'poly11' );
 opts = fitoptions( 'Method', 'LowessFit' );
 opts.Normalize = 'on';
 opts.Robust = 'LAR';
 [fitresult, gof] = fit( [full_data(:,1), full_data(:,2)], full_data(:,3), ft, opts );

is it possible to plot the contours for this surface after i plotted the surface itself using the next command:

plot(fitresult, [full_data(:,1), full_data(:,2)], full_data(:,3) );

thank you for your help.

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Answer 1

Mike Garrity 2015-7-8

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/229034-how-to-create-a-contour-for-a-fittype-object#answer_185410

编辑：Mike Garrity 2015-7-8

在 MATLAB Online 中打开

One simple way is to get the data from the surface that the plot method creates.

h = plot(fitresult, [full_data(:,1), full_data(:,2)], full_data(:,3) );
s = findobj(h,'Type','surface');
figure
contour(s.XData,s.YData,s.ZData)

The "cleaner" option would be to use the feval method. You need to pass in the XData and YData. Something like this:

load franke
T = table(x,y,z);
f = fit([T.x, T.y],T.z,'linearinterp');
[x,y]=meshgrid(linspace(500,3500,40),linspace(0,1,40));
z=feval(f,x,y);
contour(x,y,z)