On 17/12/2009 5:33 AM, Cormac Long wrote:
Hello,
I have the following problem when trying to use rm:
In a top level script file I have a loop iterating over some index. The loop
is not contained within a function, so the scope of variables declared in
the loop is global. Within this loop I generate several variables which
should be removed at the end of each iteration. To do this, I wrote a
function to clean up the workspace. An example is included here:
cleanUpWorkspace<-function()
{
#Remove key data sructures, if they have been declared:
delList<-list()
for(varname in c("rv1","rv2", "rv3", "rv4")) {
if(exists(varname)) {
delList<-append(delList, varname)
}
}
if(length(delList)>0) {
rm(list=delList, pos=-1)
#rm(list=delList, envir=parent.env(environment()))
#rm(list=delList, envir=globalenv())
}
}
Unfortunately, this fails to work - it aborts with the following error:
Error in rm(list = delList, pos = -1) : invalid first argument
if I use rm(list=delList, pos=-1)
Your delList is a list. Despite the name of the argument, it doesn't
want a list, it wants a character vector. So create it as character(0),
and append elements using delList <- c(delList, varname).
BTW, I'd recommend using the envir=globalenv() version of your rm()
call, as it says most clearly that your function is messing with the
global environment. But first I'd recommend not messing with the global
environment; think of some other way to share data between functions,
e.g. defining them all in the same environment, etc.
Duncan Murdoch
Or with the following error:
Error in rm(list = delList, evir = parent.env(environment())) :
... must contain names or character strings
if I use rm(list=delList, envir=parent.env(environment())) or
rm(list=delList, envir=globalenv())
I get the same errors if I bypass rm entirely and use
.Internal(remove(delList, globalenv(),FALSE)).
I am using R version 2.10.0 running on a windows 7 box.
I want to declare the clean-up within a function for design purposes. The
full project is spread over several files and I am trying to keep the main
loop as simple as possible.
Sincerly,
Cormac Long.
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