On Tue, 2011-06-07 at 16:17 +0200, Uwe Ligges wrote:
>
> On 07.06.2011 11:57, peter dalgaard wrote:
> >
> > 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
On 07.06.2011 11:57, peter dalgaard wrote:
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 he
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:
> f
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.
On Mon, 6 Jun 2011, Prof Brian Ripley wrote:
On Sun, 5 Jun 2011, Abhilash Balakrishnan wr
On Sun, 5 Jun 2011, Abhilash Balakrishnan wrote:
Dear Mr. Murdoch,
I find out that still do not understand why the following does not work:
curve(expression(x))
Error in xy.coords(x, y, xlabel, ylabel, log) :
'x' and 'y' lengths differ
As here the input to curve is an expression, as docume
Dear Mr. Murdoch,
I find out that still do not understand why the following does not work:
> curve(expression(x))
Error in xy.coords(x, y, xlabel, ylabel, log) :
'x' and 'y' lengths differ
As here the input to curve is an expression, as documented in the help, and
the expression is simply x.
Dear Mr. Murdoch,
I now understand that curve does not know how to guess what x in curve(x)
means. As you say, it might guess that x means a function, and if there is
a function x, execute it. This is seen in the example:
> x <- function(x) { x }
> curve(x)
I think, if curve guesses I have a f
On 11-06-05 1:07 PM, Abhilash Balakrishnan wrote:
Dear Sirs,
I am a new user of the R package. When I try to use the curve function it
confuses me.
curve(x^2)
Works fine.
curve(x)
Makes a complaint I don't understand. Why is x^2 valid and x is not?
curve() is a convenience function, an
I think there is trouble because expr in curve(expr) may be the name of
a function, and it's ambiguous whether 'x' should be interpreted as a
mathematical expression involving x, or the name of a function. Here are
some examples that work:
curve(I(x))
curve(1*x)
On Sun, 2011-06-05 at 12:07 -0500,
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