[R-sig-Geo] problem with loop formula in my analysis

[G. Allegri]

A correction.
cp["Z"] should be get(cp)[z], to evaluate the string to a variable name...

2008/11/19 G. Allegri <giohappy at gmail.com>:
> 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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>>
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>