Hello!
I have the following:
zzz <- expression(y[3]*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
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`[` is a function. So the deriv program is seeing `[`(y,3)*r1 + r2> letters[5][1] "e"> `[`(letters, 5)[1] "e" On Fri, Jan 9, 2015 at 12:31 PM, Erin Hodgess <erinm.hodgess at gmail.com> wrote:> Hello! > > I have the following: > > zzz <- expression(y[3]*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]] > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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.
Ah! Ok....thanks very much! Sincerely, Erin 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[5] > [1] "e" > > `[`(letters, 5) > [1] "e" > > On Fri, Jan 9, 2015 at 12:31 PM, Erin Hodgess <erinm.hodgess at gmail.com> > wrote: > > Hello! > > > > I have the following: > > > > zzz <- expression(y[3]*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]] > > > > ______________________________________________ > > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > > 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. >-- Erin Hodgess Associate Professor Department of Mathematical and Statistics University of Houston - Downtown mailto: erinm.hodgess at gmail.com [[alternative HTML version deleted]]
One more thing, please: (just like Columbo) Is there a work-around for this, please? Thanks again, Erin 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[5] > [1] "e" > > `[`(letters, 5) > [1] "e" > > On Fri, Jan 9, 2015 at 12:31 PM, Erin Hodgess <erinm.hodgess at gmail.com> > wrote: > > Hello! > > > > I have the following: > > > > zzz <- expression(y[3]*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]] > > > > ______________________________________________ > > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > > 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. >-- Erin Hodgess Associate Professor Department of Mathematical and Statistics University of Houston - Downtown mailto: erinm.hodgess at gmail.com [[alternative HTML version deleted]]