On Jun 6, 2011, at 11:22 , Prof Brian Ripley wrote:
> As a further example of the trickiness, the "function" method of plot()
> relies on curve(x, ...) being a request to plot the function x(x) against x.
> I've added a comment to that effect to the help page.
Ouch. This springs to mind:
> fortune(106)
If the answer is parse() you should usually rethink the question.
-- Thomas Lumley
R-help (February 2005)
but curve() predates that insight by half a decade or more. It could probably
do with a redesign, if anyone is up to it.
By the way, it really does work if the 2nd arg is an expression object (as
opposed to an expression evaluating to an expression object):
do.call(curve,list(expression(x)))
or
cl <- quote(curve(x))
cl[[2]] <- expression(x)
eval(cl)
(The trouble with nonstandard evaluation is that it doesn't follow standard
evaluation rules...)
--
Peter Dalgaard
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd....@cbs.dk Priv: pda...@gmail.com
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