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

[Henrique Dallazuanna]

Try fixing the constants


s <- 2
c <- 3
a <- 2
P <- 1
attributes(eval(df1p))$gradient[,'P']

On Tue, Apr 6, 2010 at 10:30 AM, nickymcp <nickymcpherson at gmail.com> wrote:
>
>> f1
> ~s - c - a * P
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-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O