On 11/4/13, 11:05 AM, Gabriel Becker wrote:
As a side note, I'm not sure that existence of a symbol is sufficient (it
certainly is necessary). What about situations where the symbol exists but
is stale compared to the value in the parent? Are we sure that can never
happen?
I think this is a different issue. We want to detect when a function
depends on variables outside that function in the user's workspace, or
variables defined in a pacakge that the user has loaded. I think we can
assume that R child processes will be of the same version with the same
set of installed packages, so package-defined variables will not have
different values in child processes. For user variables, I think the
goal should be to prevent (or at least highly discourage) dependencies
on them entirely, so I don't think it matters what their value may be in
the child. I realize this is somewhat counter to the question that
started this thread, which was about exporting variables to the
children, but I think it is the most straightforward approach. As I
believe someone noted earlier in the thread, Henrik's original problem
of a recursive function is properly solved by using the "Recall" function.
-Ryan
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