problem with loop formula in my analysis

Alessandro,
I suggest to read some startup tutorials before asking in ML.
Anyway you can do this:

 for(i in 1:500){
cp <- paste(sep="","centre_plot",i)
coordinates(cp) =~X+Y
proj4string(cp) <- CRS("+init=epsg:26911")
writeOGR(cp["Z"], paste(sep="",cp,".shp"), cp,driver="ESRI Shapefile")
}



2008/11/19 Alessandro <alessandro.montaghi at unifi.it>:

Hi All,

I read a lot about loop formula but this morning I tried to applied the loop
for the following formulas

I know it's easy for an expertise, but sorry I am working with R in this
mounts and I change completely my GIS philosophy.



Thanks for help



give a coordinates attribution



coordinates(centre_plot1) =~X+Y

coordinates(centre_plot2) =~X+Y

coordinates(centre_plot3) =~X+Y

coordinates(centre_plot4) =~X+Y

......................

.....................

(I HAVE 500 plot)



proj4string(centre_plot1) <- CRS("+init=epsg:26911")

proj4string(centre_plot2) <- CRS("+init=epsg:26911")

proj4string(centre_plot3) <- CRS("+init=epsg:26911")

proj4string(centre_plot4) <- CRS("+init=epsg:26911")



writeOGR(centre_plot1 ["Z"], " centre_plot1.shp", " centre_plot1",
driver="ESRI Shapefile")

writeOGR(centre_plot2 ["Z"], " centre_plot2.shp", " centre_plot2",
driver="ESRI Shapefile")

writeOGR(centre_plot3 ["Z"], " centre_plot3.shp", " centre_plot3",
driver="ESRI Shapefile")

writeOGR(centre_plot4 ["Z"], " centre_plot4.shp", " centre_plot4",
driver="ESRI Shapefile")



Ale


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