As Sarah has said, you probably don't need to use "paste()" at all. However
if "command" is a text string containing a (syntactically correct) R command
you can execute it via
eval(parse(text=command))
E.g.:
command <- "x <- 42"
eval(parse(text=command))
x
[1] 42
I find this to be a useful trick in quite a few contexts.
cheers,
Rolf Turner
On 23/08/11 08:43, Sarah Goslee wrote:
Juta,
On Mon, Aug 22, 2011 at 4:29 PM, Juta Kawalerowicz
<juta.kawalerow...@stx.ox.ac.uk> wrote:
Dear list,
I have a spacialPolygonDataFrame where variables were unnecessarily imported as
factors. So I am trying to unfactor variables from spatialPolygonDataFrame@data
with a loop
for (i in (1:length(names( spatialPolygonDataFrame)))){
command<-paste("spatialPolygonDataFrame$names(spatialPolygonDataFrame@data[",i,"])<-as.character(
spatialPolygonDataFrame$names( spatialPolygonDataFrame@data[",i,"])")
command<-noquote(command)
command
}
But I keep getting just a printout
Yeah, you're putting together a string, not actually running any commands.
Does this not work:
for (i in (1:length(names( spatialPolygonDataFrame)))){
spatialPolygonDataFrame$names(spatialPolygonDataFrame@data[i])<-
as.character( spatialPolygonDataFrame$names(
spatialPolygonDataFrame@data[i]))
}
Subsetting on a variable should work just fine. I don't see any need for
paste().
Sarah
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