[R] inout() in splancs working properly?

Rainer Hurling rhurlin at gwdg.de
Tue Jun 5 15:19:38 CEST 2001


sorry for not recognizing you as the author of the port.

Roger Bivand wrote:
> Rainer:
> Thankyou for your very helpful report, showing clearly and replicably what
> the problem is: sometimes points on the convex hull are included,
> sometimes not. I agree that the issue is in ipippa.f, but am not too sure
> why (yet). I am working on a revision of splancs at the moment - can I use
> you to help test out this issue?

Of course you can. I will test it with my datasets.

> (Barry - is this so far back in the past that you don't have Ken
> McElvain's C-code? Are we dealing with:
> http://jedi.ks.uiuc.edu/~johns/raytracer/rtn/rtnv3n4.html#art23
> Does the original comment:
> ">A remark: The whichquad function is not perfect. It doesn't handle
> >the boundary cases right (but as I said, that's only a problem
> >if the point lies on the polygon)."
> still hold?)
> Thanks again,
> Roger
> --
> Roger Bivand
> Economic Geography Section, Department of Economics, Norwegian School of
> Economics and Business Administration, Breiviksveien 40, N-5045 Bergen,
> Norway. voice: +47 55 95 93 55; fax +47 55 95 93 93
> e-mail: Roger.Bivand at nhh.no
> and: Department of Geography and Regional Development, University of
> Gdansk, al. Mar. J. Pilsudskiego 46, PL-81 378 Gdynia, Poland.


Rainer Hurling, Ass. d. Fd.                  email: rhurlin at gwdg.de
Institut fuer Forstzoologie und Waldschutz   http://www.gwdg.de/~rhurlin
Georg-August Universitaet Goettingen         office: 0551 39-2291
Buesgenweg 3, D-37077 Goettingen, GERMANY    fax: 0551 39-2089
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