Hello,
I'm trying to access an object, given only its name as a symbol. I cannot
figure out how to proceed. Suppose I call substitute( ) on the expression
'x + 2':
> parse.tree <- substitute(x + 2);
The constituents of parse.tree are of type symbol and numeric:
> str(parse.tree[[1]])
symbol +
> str(parse.tree[[2]])
symbol x
> str(parse.tree[[3]])
num 2
Suppose that x is S4 object, and that I need to access a slot of that
object. How can I do so, using only 'parse.tree' (or parse.tree coerced
into a list)?
Thanks, Patrick
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