[R-sig-Geo] maptools packages : shp2SLDF (R-Grass)

[Roger Bivand]

On Mon, 29 May 2006, massimosisasha wrote:

> hi, i'm tring to do the various example on :
> 
> http://skagit.meas.ncsu.edu/~helena/publwork/GRASSnews_vol3.pdf
> 
>   until  to pag.14
> i have not problems
>   but at :
> 
> Using the spgrass6 package with
> vector data...
> 
> at the  line :
>    > streams <- shp2SLDF(res, proj4string = p4s)
> 
> i've this error message :
> 
> Errore: non trovo la funzione "shp2SLDF"
> 
> ??? why ???
> i've read the maptools pdf but i have not find the    shp2SLDF   
> command :-(

I'm travelling and not able to give an authoritative answer now, but 
please try maptools function readShapeLines() which if I remember 
correctly includes the function you mention, but saves the step of first 
reading the shape object. The GRASS-News note was written a year ago, and 
the sp/maptools/rgdal combination on the R side has developed strongly. 
You may also consider readOGR() in rgdal to read shapefiles into 
appropriate Spatial* objects.

Roger

> 
> can you hel me ?
> thanks!
> Massimo.
> 
> 
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-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no