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Re: NaN and Surf function

From: David Grohmann
Subject: Re: NaN and Surf function
Date: Fri, 22 Sep 2006 16:42:17 -0500
User-agent: Thunderbird (Windows/20060909)

David Bateman wrote:
Kyle Snow wrote:
My question is regarding the handling of NaN values for the Z-coordinate
in the function




These values exist because my gridded data set has an irregular
boundary. The surf command does not seem to handle this well. In matlab,
these data points are simply not plotted, and the surf plot for the
non-NaN points looks fine. Is there a way I can get this to work using
Octave’s surf function?


Note that I am running WindowsXp, and I downloaded the exe file from

I have not obtained the Octave source code.

There is a difference between octave 2.1 and matlab, in that the NaN's
are removed from the data before plotting in octave, whereas matlab uses
them to flag unconnected line segments. Octave 2.9 was adapted to have
matlab's behavior. The change is not too major, but does mean a certain
level of backporting from 2.9 to 2.1 and a recompile.. Better to go to a
2.9.x release if you can. Sorry I still haven't gotten back to my mingw
2.9 release, but will one day (if someone doesn't what to take it off my
hands), so you might be limited to linux releases of 2.9 at the moment...


Help-octave mailing list
I was evaluating a windows octave a while back and found this windows version, it comes with 2.9.4 I don't know if it solves your problem.

It has a gui and the command line interface.
David Grohmann
Senior Student Associate
Applied Research Lab : UT Austin : ESL - S206
Office: 512-835-3237

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