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In Matlab, how do I plot irregularly spaced data?

To plot irregularly spaced data in Matlab, use the TriScatteredInterp command to create a data structure for interpolation.

The example below plots a saddle-shaped surface by interpolating over 100 random data points:

%Pick random x and y coordinates % and compute z values. x = rand(100,1)*10-5; y = rand(100,1)*10-5; z = x.^2 -y.^2; %Construct the interpolant and use to evaluate % zi for values (xi,yi) F = TriScatteredInterp(x,y,z); ti = -5:.1:5; [xi,yi] = meshgrid(ti,ti); zi = F(xi,yi); %Plot the interpolated surface in black plot3(xi,yi,zi,'k'); %Add the original data points in red hold on; plot3(x,y,z,'or'); hold off

For more about statistical and mathematical software, email the UITS Stat/Math Center, visit the center's web page, or phone 812-855-4724 (IUB) or 317-278-4740 (IUPUI). The center is located in Bloomington at 410 N. Park Avenue, and is open for consultation by appointment Monday-Friday 9am-5pm.

This is document afqy in domain all.
Last modified on February 28, 2011.

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