Looking for triangulator/interpolator
grante at visi.com
Sat May 27 15:11:23 CEST 2006
On 2006-05-27, Travis E. Oliphant <oliphant.travis at ieee.org> wrote:
> Not that you made a bad choice. I do wonder, how much of your
> difficulty was with the interface to the underlying fitpack
I've no idea. I had never done anything with splines before,
so it's quite possible I just wasn't doing things right. I
never got it to work at all for non-gridded data (which is what
I needed). Since it wasn't stable even for gridded data, I
more or less gave up.
> The interface is pretty involved as there are lots of
> parameter choices to the underlying routine. It's very
> possible the interface is broken in some strange way.
I took a look at underlying Fortran code, but that made my
> Given how many people want to do interpolation. I'm surprised
> nobody has looked into fixing up the fitpack routines that do
> it. I suppose it's possible that the underlying fitpack
> routines are faulty in 2-d.
> Your examples will help in that study.
> Pearu made some nice class-based interfaces to fitpack in
> 2003. They are in SciPy, but, it appears that people aren't
> making much use of them. Did you try them?
Not that I remember.
For that particular application, the interpolation had to be
done in real time, so a triangulation scheme turned out to be a
lot faster [with some constraints on the input data to make the
triangle search O(sqrt(N))].
Grant Edwards grante Yow! Are the STEWED PRUNES
at still in the HAIR DRYER?
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