The problem is that brace brackets are not in the derivatives table.
Make sure you don't have any.
On 9/3/07, Alberto Vieira Ferreira Monteiro <[EMAIL PROTECTED]> wrote:
> Gabor Grothendieck wrote:
> >
> > Actually in thinking about this its pretty easy to do it without Ryacas
> > too:
> >
> > Df <- f
> > body(Df) <- deriv(body(f), "x")
> > Df
> >
> This is weird.
>
> f <- function(x) { x^2 + 2*x+1 }
> Df <- f
> body(Df) <- deriv(body(f), "x") # error
>
> Also:
>
> f <- function(x) x^2 + 2 * x + 1
> Df <- f
> body(Df) <- deriv(body(f), "x") # ok
> D2f <- f
> body(D2f) <- deriv(body(Df), "x") # error
>
> Alberto Monteiro
>
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