You can only use those functions that Ryacas knows about or that Yacas 1.0.63 knows about:
library(Ryacas) View(transtab) and ls("package:Ryacas") The Ryacas home page http://ryacas.googlecode.com has links to the yacas home page. Sometimes using the first few terms of the Taylor representation is sufficient workaround. On Jan 31, 2008 12:01 PM, Doran, Harold <[EMAIL PROTECTED]> wrote: > I'm tinkering around in Ryacas trying to find an easy way to get the > first and second partial derivatives of mu and sigma from a normal > distribution (actually a bitterly ugly likelihood but this example works > for now). > > I've done all of the work in Mathematica, but I then need to manually > write R code whereas I think Ryacas will give me the expression such > that I can export for Tex and produce code I can use for a function. Is > there a way I can use Ryacas with built in functions, like dnorm? > > For example, I can define the normal and then use the D function as: > > ndist<-expression( (1/(s*sqrt(2*pi))) * exp(- ((x-u)^2/(2*s^2)))) > D(ndist, "u") > > But, I don't see in the vignette a way to use dnorm? > > ______________________________________________ > 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. > ______________________________________________ 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.