How to plot a surface-like plot when the data is not regularly spaced

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Abhinav
Abhinav 2017-12-12
评论： Abhinav 2017-12-13
I have 3-d data, where first two columns (x,y) are independent and the third column (z) is dependent upon first two. I want to have a surface plot of the data so that I can see what region in (x,y) space gives low values of z and what region gives high values of z. But I am not able to use a surface plot because the data is not regularly spaced as required for using 'surf'. I have attached the mat-file containing three columns for reference. Is there a good way of solving this problem?

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Michal Dobai
Michal Dobai 2017-12-12
编辑：Michal Dobai 2017-12-12
How about this?
[xi,yi] = meshgrid(0:0.01:10, 0:0.01:10);
zi = griddata(demodata(:,1),demodata(:,2),demodata(:,3),xi,yi);
handle = surf(xi,yi,zi, 'EdgeColor', 'none');
% I adjusted color limits for better-looking plot of your data
handle.Parent.CLim = [-100 -80];
There is the whole page about it MATLAB in documentation: Interpolating Scattered Data
Result plot:
Is this what you need?
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Les Beckham
Les Beckham 2017-12-13
If you have to deal with smoothing out noise in the data, or extrapolating beyond the edges of your grid, you might want to take a look at John D'Errico's excellent File Exchange submission gridfit.

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