Surf plot of my data

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Jérôme
Jérôme 2013-4-2
Hello;
I have data in the following format : [X1 X2 F] where X1, X2 and F are all column vectors. F is a function evaluated on X1 and X2. I do not know what function it is, I only have the end result.
I successfully plotted my data using
% trainset contains the data as presented above
scatter3(trainset(:,1),trainset(:,2),trainset(:,3),30,trainset(:,3));
% I use the value of F for the coloring of the datapoints
However I would prefer a real surface plot, using surf(). But the format of my data is not suited to surf, apparently.
I thought about using meshgrid to make the grid matrices for X1 and X2, but since I don't know the function F, I won't be able to evaluate it on those grids ; I'm stuck with the dataset I'm provided with, in which F is already evaluated for some pairs of X1 and X2.
I might be missing something obvious but I really don't see how to get a surface plot with that kind of "blackbox" data.
Thanks in advance for your insights!

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回答（2 个）

Walter Roberson
Walter Roberson 2013-4-2
Use griddata(). Or use triscatteredinterp to create an interpolator and interpolate it over a mesh created with ndgrid()
Omid Adljuy
Omid Adljuy 2013-4-5
Probably the TriScatteredInterp command will help you do what you're looking for.
See MATLAB Help for mor details and examples.
This tutorial video shall also help.

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