You should be able to use deriv(..., func=TRUE) to get a function returned,
instead of an expression.
If you need to use D, here's a rather clumsy way that seems to work:
> dx2x <- D(expression(x^2), name="x"); dx2x
2 * x
> eval(parse(text=paste("f <- function(x){",
paste(deparse(dx2x), collapse=";"), "}")))
> f
function(x){ 2 * x }
HTH,
Andy
> From: Erin Hodgess [mailto:[EMAIL PROTECTED]
>
> Dear R People:
>
> When the D function is used for a symbolic derivative,
> an expression is returned, which is fine.
>
> How do you change that expression to a function, please?
>
> I've been experimenting with substitute and deparse, but no
> success yet.
>
> This is R 1.8.0 for Windows.
>
> thanks in advance for the help!
>
> Sincerely,
> Erin Hodgess
> mailto: [EMAIL PROTECTED]
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