[R] a symbolic derivative question, please
erinm.hodgess at gmail.com
Fri Jan 9 19:37:17 CET 2015
Ah! Ok....thanks very much!
On Fri, Jan 9, 2015 at 1:09 PM, Richard M. Heiberger <rmh at temple.edu> wrote:
> `[` is a function. So the deriv program is seeing
> `[`(y,3)*r1 + r2
> > letters
>  "e"
> > `[`(letters, 5)
>  "e"
> On Fri, Jan 9, 2015 at 12:31 PM, Erin Hodgess <erinm.hodgess at gmail.com>
> > Hello!
> > I have the following:
> > zzz <- expression(y*r1 + r2)
> > deriv(zzz,c("r1","r2"))
> > Error in deriv.default(zzz,c("r1","r2")) :
> > Function '`[`' is not in the derivatives table
> > What am I missing, please? Since y is not one of the variables that is
> > being "acted upon", why is the  an issue, please?
> > Thank you for any help!
> > Sincerely,
> > Erin
> > --
> > Erin Hodgess
> > Associate Professor
> > Department of Mathematical and Statistics
> > University of Houston - Downtown
> > mailto: erinm.hodgess at gmail.com
> > [[alternative HTML version deleted]]
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Department of Mathematical and Statistics
University of Houston - Downtown
mailto: erinm.hodgess at gmail.com
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