Re: [Plplot-devel] plgriddata builds & works

[Joao C. <jc...@fe...>]

On Monday 03 March 2003 15:59, Alan W. Irwin wrote:
> > Take a look at:
> >
> >     http://people.debian.org/~rafael/griddata.ps
>
> Wow!
>
> > Thanks very much for this valuable addition, Jo=E3o!
>
> Seconded!
>
> Alan

As I said when I committed x21c.c, don't be fooled by the default plots.
Try specially the --randn option, to simulate non-uniform sampling, and a=
lso=20
the -rosen function, that is much less smooth than the sombrero function.
Also, verify that some algorithms are not very sensitive to peaks, while=20
others are sensitive in excess.

Also, there are border effects on most algorithms, as they return NaNs wh=
ere=20
interpolation/approximation is not possible, and I have to circumvent the=
=20
fact that Plplot is not NaN/Inf aware(my next to come but always delayed=20
project). To solve the problem  I do local averaging, when possible.

The last cvs commits I have done will enable all you that (still) don't h=
ave=20
Qhull installed in your systems to try plgriddata(). Please try it before=
=20
installing qhull.

I'm still working on x12c.c, so that the plots show a fair comparison of =
the=20
several algorithms and do not give (harmless) errors at the same time.

Joao

> __________________________
> Alan W. Irwin
> email: ir...@be...
> phone: 250-727-2902
>
> Astronomical research affiliation with Department of Physics and Astron=
omy,
> University of Victoria (astrowww.phys.uvic.ca).
>
> Programming affiliations with the Canadian Centre for Climate Modelling=
 and
> Analysis (www.cccma.bc.ec.gc.ca) and the PLplot scientific plotting
> software package (plplot.org).
>
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