[R-sig-Geo] problem with example inverse distance weighted (IDW) interpolation

[melita]

Thanks, Edzer. 
I had a feeling this is the case, that idw is called from spatstat
instead from gstat in my session. 
So what I did is detach and call the gstat again, so it can overrides
spatstat idw function. 
detach(package:gstat) 
library(gstat) 
PS: I appreciate the live streaming of the lectures from GEOSTAT 2012 in
Muenster last week. 
Sincerely, 
Melita. 
At 13:03 13.9.2012, you wrote: 
On 09/13/2012 12:43 PM, melita
wrote: > # Error: is.ppp(X) && is.marked(X) is not TRUE
Melita, thanks for bringing this up. If you first load package gstat, and
then load package spatstat, you'll see the following warning: Attaching
package: ‘spatstat’ The following object(s) are masked from
‘package:gstat’:     idw At some stage package
spatstat decided to provide inverse distance weighting and and also call
the function to do this idw, but using other syntax and assumptions about
the arguments provided than gstat does. There's no way for gstat to catch
this as it is now, as gstat::idw is not called at all. A solution would
be to not load spatstat, or load spatstat after gstat (in which case the
conflict will point to spatstat:idw being masked by gstat). The spatstat
package authors could solve this conflict if idw in spatstat was also
defined as an S4 method, as gstat does, rather than as a function. Now it
comes up, I'm curious why, as spatstat suggests, one would want to
interpolate point pattern marks. As there are no marks where there are no
points, how should the interpolated values be understood? Or is this
intended to be done outside the observation window? -- Edzer Pebesma
Institute for Geoinformatics (ifgi), University of Münster Weseler
Straße 253, 48151 Münster, Germany. Phone: +49 251 8333081, Fax: +49
251 8339763 

http://ifgi.uni-muenster.dehttp://www.52north.org/geostatistics
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