Ludwig, your email does not contain the original posting, please include

or repeat in future mailings.

The original question was, I believe, about local fitting of trend surfaces.

This error can for instance happen when your neighbourhood is too small,

or does not contain enough information.

For a first order linear trend surface, a local neighbourhood should

have at least three points, and irrespective the neighbourhood size, the

points should not be aligned (on a straight line). My hint is that one

of these conditions is not met in your setup.

You can try to set debug level to powers of two (2, 8 or 16 seem

relevant) to get detailed input about the conditions under which this

happens.

On 06/10/2013 05:15 PM, Ludwig Hilger wrote:

> Hello everybody,

>

> unfortunately I have to come up with a follow-up question. As described

> above, this has worked now perfecty at first with some of my data, but with

> another dataset (but it has the same structure, etc) I get the following

> error:

>

> "solve.c", line 88: singular matrix in function Usolve()

> Fehler in predict.gstat(g, newdata = newdata, block = block, nsim = nsim, :

> Usolve

>

> I have no idea what my R is trying to tell me... any hints?

>

> thank you again everybody,

>

> Ludwig

>

>

>

> -----

> Dipl. Geogr. Ludwig Hilger

> Wiss. MA

> Lehrstuhl für Physische Geographie

> Katholische Universität Eichstätt-Ingolstadt

> Ostenstraße 18

> 85072 Eichstätt

>

> Tel.: 08421-93-1180

> --

> View this message in context:

http://r-sig-geo.2731867.n2.nabble.com/Local-plane-fitting-to-Point-Cloud-tp7583724p7583746.html> Sent from the R-sig-geo mailing list archive at Nabble.com.

>

> _______________________________________________

> R-sig-Geo mailing list

>

[hidden email]
>

https://stat.ethz.ch/mailman/listinfo/r-sig-geo>

--

Edzer Pebesma

Institute for Geoinformatics (ifgi), University of Münster

Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251

83 33081, Fax: +49 251 8339763

http://ifgi.uni-muenster.de_______________________________________________

R-sig-Geo mailing list

[hidden email]
https://stat.ethz.ch/mailman/listinfo/r-sig-geo