mesh() and surf() errors & sorting [x, y, z] matrix into meshgrid matrix.

[Michael Barton]

I have a large collection of data points in the form of (x,y,z) coordinates
stored in an [N,3] matrix.  Octave can successfully run: plot3() with any
warnings or errors.  However, I need to use contour() and surface plots like
surf() and mesh().  Unfortunately, Octave crashes with a memory error with
the command: contour().

As for surf() and mesh(), the following error messages are returned:
surf(DataSet(:,1),DataSet(:,2),DataSet(:,3)):
error: rows(z) must be the same as length(y) and columns (z) must be the
same as length(x)
...

mesh(DataSet(:,1),DataSet(:,2),DataSet(:,3)):
error: rows(z) must be the same as length(y) and columns (z) must be the
same as length(x)
...


>From the documentation, surf() and mesh() require the a grid of x and y data
to be established.  Is there anyway to sort the DataSet matrix in such a way
that surf() and mesh() plot successfully?
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