Plot irregularly spaced data in MATLAB

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

  %Add the original data points in red
  hold on; plot3(x,y,z,'or'); hold off

If you have questions about using statistical and mathematical software at Indiana University, contact Research Analytics.

This is document afqy in the Knowledge Base.
Last modified on 2019-01-31 15:36:11.

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