[R] Error opening SHP file (maptools)

[Don MacQueen]

The help page for readShapePoints says that the file name that you 
supply should not include the extension.

The "system.file" part of the example in the help page is only to use 
the example file that came with the package. Since you want to open 
your own file you omit the system.file() bit.

Do something like:

    readShapePoints( 'C:/path_to_my_file/filename')

Hope this helps.
-Don

At 12:05 PM -0600 3/11/08, gerickes at earthlink.net wrote:
>I am having difficulty loading a points shapefile (1600 records) I 
>generated from ArcGIS as a PointsSpatialDataFrame using the maptools 
>readShapePoints function.
>
>library(maptools)
>surveypts <- readShapePoints(system.file("C:/temp/survey.shp", 
>package="maptools")[1]
>Error in getinfo.shape(filen) : Error opening SHP file
>
>I've tried numerous re-exports and renames of the dataset, to no 
>avail. I've also tried placing the shapefile in the library's 
>shapefile folder, with the example dataset (see example below).
>
>x <- readShapePoints(system.file("shapes/survey.shp", package="maptools")[1]
>
>No luck there either. I'm quite new to R, but I can follow a manual 
>and google well enough. However, I haven't seen anything to help me. 
>The example point datasets load fine. I figure that I'm missing on 
>some familiarity with R and that I don't know the tricks yet. Any 
>help?
>
>Thanks in advance.
>
>Gericke Cook
>USDA-APHIS-PPQ
>
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-- 
---------------------------------
Don MacQueen
Lawrence Livermore National Laboratory
Livermore, CA, USA
925-423-1062
macq at llnl.gov