[R] Throwing expressions around
Barry Rowlingson
B.Rowlingson at lancaster.ac.uk
Fri Sep 24 17:35:51 CEST 2004
I'm trying to write some code that throws a few expressions around the
place, and I've boiled down the problem to be equivalent to this.
Consider the curve function which plots expressions in 'x':
> curve(x^2)
Now wrap that in the most naive wrapper function:
> fc=function(m){curve(m)}
and try it:
> fc(x^2)
Error in eval(expr, envir, enclos) : Object "x" not found
What could be done to my 'fc' or the expression processing of curve to
make this sort of thing work?
What I also want to do is provide a default, something like:
fc = function(m=sqrt(x)){curve(m)}
It's not actually curve() that I want to call, but something similar
I've written myself, so I can fiddle with that as I wish.
I've had a read of the R Language Definition - I imagine the answer is
in there somewhere...
Barry
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