CRAN suggests it's not available for windows since the build can't be automated: http://cran.r-project.org/bin/windows/contrib/r-release/ReadMe
but it suggests builds are available from Prof Ripley (to whom be honor and praise for ever and ever, amen!) here: http://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/2.14/ Michael On Sun, Jan 22, 2012 at 3:52 PM, David Stevens <david.stev...@usu.edu> wrote: > I'm following this thread and got curious about Ryacas. After installing > yacas and Ryacas, I was alerted to the missing XML package for Windows. > I couldn't find in on a couple of mirrors so I tried > http://www.omegahat.org/RSXML/ and > > install.packages("XML", repos = "http://www.omegahat.org/R";) > > but got > > Installing package(s) into 'D:/Users/David > Stevens/Documents/R/win-library/2.14' > (as 'lib' is unspecified) > Warning message: > In getDependencies(pkgs, dependencies, available, lib) : > package 'XML' is not available (for R version 2.14.1) > > for my troubles. The date on the omegahat site is 17 Jan 2012. Am I missing > something? > > David Stevens > > > > On 1/22/2012 12:39 PM, Gabor Grothendieck wrote: >> On Sun, Jan 22, 2012 at 1:25 PM, Eliano<eliano.m.marq...@gmail.com> wrote: >>> People, >>> >>> I'm researching some Bayesian statistic topics and in the midle of my study >>> i found a very simple problem and i'm trying to find a simple package to >>> solve this type of equations: >>> >>> Lets say that i need to compute beta values for the beta distribution and i >>> now for example: >>> >>> E(teta)=a/(a+b) = 0,5 >>> Var(teta)=ab/((a+b)^2(a+b+1))=0.05 >>> >>> So if i want to solve this to non-linear system to find a,b for the beta >>> distribution wich pack should i use? >>> >> The equations giving a and b as a function of m and v are: >> >>> library(Ryacas) >>> a<- Sym("a"); b<- Sym("b") >>> m<- Sym("m"); v<- Sym("v") >>> Solve( List(a/(a+b) == m, a*b/((a+b)^2*(a+b+1)) == v), List(a, b) ) >> expression(list(list(a == m^2 * (1 - m)/v - m, b == a/m - a))) >> >> Based on the above we write this R function: >> >> beta.parms<- function(m, v) { >> a<- m^2 * (1-m)/v - m >> b<- a/m - a >> c(a = a, b = b) >> } >> >> and run it: >> >>> beta.parms(m = 0.5, v = 0.05) >> a b >> 2 2 >> > > -- > David K Stevens, P.E., Ph.D., Professor > Civil and Environmental Engineering > Utah Water Research Laboratory > 8200 Old Main Hill > Logan, UT 84322-8200 > 435 797 3229 - voice > 435 797 1363 - fax > david.stev...@usu.edu > > > > > [[alternative HTML version deleted]] > > ______________________________________________ > 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.
