That is probably because idw.locations is not exported in the package NAMESPACE. I would try instead:
loc.idw <- idw(value~1, NARR, loc, idp = 1.0, debug.level = 1) On 04/04/2012 05:10 PM, Anthony Fischbach wrote: > I receive the following error after issuing the function call below with the > following objects. > Please advise. > > #### Objects ## > ## NARR a SpatialPointsDataFrame containing values to be interpolated > coordinates value > 1 (-170.312, 70.5) 1.141060 > 2 (-170.125, 70.5) 1.128586 > 3 (-170.312, 70.6875) 1.399495 > 4 (-170.125, 70.6875) 1.372585 > > ## loc a SpatialPointsDataFrame with a point onto which I wish to > interpolate the NARR values > coordinates value > 1 (-170.27, 70.6) NA > > #### Function Call ## > loc.idw<-idw.locations(formula=value~1, locations=NARR, newdata=loc, idp = > 1.0, debug.level = 1) > > #### Error text ## > Error: could not find function "idw.locations" > > #### sessionInfo() ## > R version 2.15.0 (2012-03-30) > Platform: x86_64-pc-mingw32/x64 (64-bit) > > locale: > [1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United > States.1252 > [3] LC_MONETARY=English_United States.1252 LC_NUMERIC=C > > [5] LC_TIME=English_United States.1252 > > attached base packages: > [1] stats graphics grDevices utils datasets methods base > > other attached packages: > [1] gstat_1.0-10 spacetime_0.6-2 xts_0.8-6 zoo_1.7-7 > sp_0.9-98 RCurl_1.91-1.1 bitops_1.0-4.1 > > loaded via a namespace (and not attached): > [1] grid_2.15.0 lattice_0.20-6 tools_2.15.0 > > ----- > Tony Fischbach, Wildlife Biologist > Walrus Research Program > Alaska Science Center > U.S. Geological Survey > 4210 University Drive > Anchorage, AK 99508-4650 > > afischb...@usgs.gov > http://alaska.usgs.gov/science/biology/walrus > -- > View this message in context: > http://r-sig-geo.2731867.n2.nabble.com/error-calling-gstat-idw-locations-tp7436818p7436818.html > Sent from the R-sig-geo mailing list archive at Nabble.com. > > _______________________________________________ > R-sig-Geo mailing list > R-sig-Geo@r-project.org > 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 8333081, Fax: +49 251 8339763 http://ifgi.uni-muenster.de http://www.52north.org/geostatistics e.pebe...@wwu.de _______________________________________________ R-sig-Geo mailing list R-sig-Geo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo