dnorm() is an internal function, so I don't see how D (or deriv) can do anything with it symbolically. Am I missing something?
-- Bert > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Spencer Graves > Sent: Wednesday, January 25, 2006 2:43 PM > To: [email protected] > Subject: [R] D(dnorm...)? > > Can someone help me understand the following: > > > D(expression(dnorm(x, mean)), "mean") > [1] 0 > > sessionInfo() > > R version 2.2.1, 2005-12-20, i386-pc-mingw32 > > attached base packages: > [1] "methods" "stats" "graphics" "grDevices" "utils" > "datasets" > [7] "base" > > By my computations, this should be something like > ((mean-x)/sd^2)*dnorm(...). > > Thanks for your help. > Spencer Graves > > ______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
