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 <nickymcpher...@gmail.com> wrote: > >> f1 > ~s - c - a * P > -- > View this message in context: > http://n4.nabble.com/Extracting-formulae-from-expression-deriv-tp1752738p1752816.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
