Re: FlatField.evaluate() returning missing

• To: Bill Hibbard <billh@xxxxxxxxxxxxx>
• Subject: Re: FlatField.evaluate() returning missing
• From: Cicero Augusto Wollmann Zandoná <cicero@xxxxxxxxxx>
• Date: Tue, 6 Sep 2005 17:04:29 -0300

Hi Bill,

Just for the archive: 

Whit the new Gridded2DSet behavior became consistent (always returning 
missing). And after I fixed my createDomain() method everything went just 
fine.

Thanks again,
Cicero


Em Seg 05 Set 2005 20:26, você escreveu:
> Hi Cicero,
>
> Nasty bug here. Your application is constructing a
> degenerate Gridded2DSet and the consistency test in
> the Gridded2DSet constructor is not catching it.
>
> Your createDomain() computes the same dx (and dy)
> value for i=HALFDIM and i=HALDIM+1 (j=...). Thus your
> grid has grid boxes with area = 0.
>
> I've put a Gridded2DSet.java whose consistency test
> catches this at:
>
>   ftp://ftp.ssec.wisc.edu/pub/visad/untested/Gridded2DSet.java
>
> Note that using a stricter test may break some applications
> that have been getting away with constructing degenerate
> grids. It is also possible that my new stricter test is
> not formulated correctly - this stuff is quite complex.
>
> So I hope the other VisAD developers may take a look at this
> and test it (the changes are marked by 'CICERO' comments
> in Gridded2DSet.java).
>
> Good luck,
> Bill

• References:
  • Re: FlatField.evaluate() returning missing
    • From: Bill Hibbard