Symbolic differentiation ("D","deriv", etc.) (PR#1928)
lylek@utk.edu writes:
lnlk<-expression(15*log(p)+11*log(1-p)) p<-15/26 D(D(lnlk,"p"),"p")
- (15 * 1/p^2 + 11 * 1/(1 - p)^2)
- (15 * 1/p^2 + 11 * 1/(1 - p)^2)
[1] -106.5212 R seems to be dropping the outer parentheses.
Yes. Duncan Murdoch has been working on that recently.
O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk) FAX: (+45) 35327907 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-devel-request@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._