On Wed, 30 Jul 2003, Damon Wischik wrote:
>
> Why does
> > curve(function(y) y^2, from=0,to=1)
> not work, whereas
> > myf <- function(y) y^2
> > curve(myf, from=0,to=1)
> work?
>
Because someone was trying to be too clever in writing curve(). The first
argument must either be an expression with the free variable `x' or the
*name* of a function. You can't specify a literal function or the name of
an expression.
The reason is that it is hard to tell whether an argument is a function or
an expression without evaluating it, and if it's an expression you may not
be able to evaluate it.
You could always use
plot(function(y) y^2)
-thomas
Thomas Lumley Assoc. Professor, Biostatistics
[EMAIL PROTECTED] University of Washington, Seattle
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