RE: NaN and Surf function

[Kyle Snow]

Thanks to both of you for the information. I will keep watching for a
new 2.9 binary version for Windows.

Kyle

-----Original Message-----
From: David Bateman [mailto:address@hidden 
Sent: Friday, September 22, 2006 5:54 PM
To: David Grohmann
Cc: Help-Octave; Kyle Snow
Subject: Re: NaN and Surf function

David Grohmann wrote:
> David Bateman wrote:
>> Kyle Snow wrote:
>>   
>>> My question is regarding the handling of NaN values for the
Z-coordinate
>>> in the function
>>>
>>>  
>>>
>>> surf(x,y,Z).
>>>
>>>  
>>>
>>> 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
>>>
>>>
http://superb-east.dl.sourceforge.net/sourceforge/octave/octave-2.1.73-1
-inst.exe.
>>>
>>> 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...
>>
>> D.
>>
>> _______________________________________________
>> Help-octave mailing list
>> address@hidden
>> https://www.cae.wisc.edu/mailman/listinfo/help-octave
>>   
> 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.
> 
> http://www.math.mcgill.ca/loisel/octave-workshop/

This is my binary of octave, with Sebastien's QT4 gui front-end. This
has certain limitations and known bugs. particulaly a scrambled error
message bug that in fact appears to be a bug in the string class of
3.3.x compiler under mingw/cingwin that might be fixed with a later
compiler. It is also missing atlas/lapack libraries, and so is slower
than it needs to be.. As I said, I'll do something about this, unless
someone else (who actually runs windows and cares) steps forward to
support a windows package of 2.9 and take this task off my hands..

D.