[R] Extracting formulae from expression() / deriv()

[Henrique Dallazuanna]

df1p is a expression, and you can use later.

On Tue, Apr 6, 2010 at 11:00 AM, nickymcp <nickymcpherson at gmail.com> wrote:
>
> Thanks for your help - this works and I get
>
>> s <- 2
>> c <- 3
>> a <- 2
>> P <- 1
>> attributes(eval(df1p))$gradient[,'P']
>  P
> -2
>
> What I really wanted was an expression that I can use later - do you think
> there's any way to do this?
>
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-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O