[R-sig-Geo] error calling gstat::idw.locations

[Anthony Fischbach]

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

AFischbach at usgs.gov
http://alaska.usgs.gov/science/biology/walrus
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