On 10/17/2006 3:49 AM, Tong Wang wrote:
> Hi all,
> I'm having sometrouble with managing the seach path, in a function , I
> need to attach some data set at the begining
> and detach them at the end, say, myfunction<- function() {
> attach(mylist); ............. detach(mylist) } ,
> the problem is, since I am still debugging this code, sometimes it got error
> and ended before reaching the end, thus
> the data is left in the searching path.
> What 's the right way to make mylist detached no matter what ?
on.exit, as Vito said.
But you may find that doing the calculations in "with" does a better
job, i.e.
with(mylist, [do something])
The advantages of with() are:
- it takes precedence over local variables; attach (by default) comes
behind local variables and the global environment. This may mean your
code fails when a user happens to have variables with the same name defined.
- it is a temporary change, so no "detach" is needed.
Duncan Murdoch
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