[Savannah-help-public] [sr #107506] octave 3.2.4 on linux cluster inconsistent with octave 3.2.3 on mac.

[kody law]

URL:
  <http://savannah.gnu.org/support/?107506>

                 Summary: octave 3.2.4 on linux cluster inconsistent with
octave 3.2.3 on mac.
                 Project: Savannah Administration
            Submitted by: kodo
            Submitted on: Wed 27 Oct 2010 05:55:56 PM GMT
                Category: None
                Priority: 5 - Normal
                Severity: 3 - Normal
                  Status: None
             Assigned to: None
        Originator Email: 
        Operating System: None
             Open/Closed: Open
         Discussion Lock: Any

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Details:

Hello, many many thanks if you can help with this bug or direct me to someone
who can:

I have a code which runs forward solves of Navier Stokes with a 4th order etd
method.  It works fine on matlab and on octave 3.2.3 on my mac, but when i
submit to queue or even run it on the cluster here, it consistently blows up! 
(as though something were wrong with the code!)  Other than standard
operations, it runs a number of FFTs.

FYI - another thing I noticed consistent with octave is that it can compute
the correct mod operation only with integers. For example, try

for pp=1:1e4
if mod(pp*.025,.1)==0
q=q+1;
end
end

pp/q

!!!!

Now, see

for pp=1:1e4
if mod(pp*.25,1)==0
q=q+1;
end
end

pp/q

 
Correctable, OK, but disconcerting! .... something similar and not nearly as
trivial is going on above, I think.


Thanks alot again, best regards,
Kody





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