On Mon, Apr 9, 2012 at 2:47 PM, Martin Maechler <maech...@stat.math.ethz.ch> wrote: > Apropos: > > I don't have the problems, the OP had, but on my ubuntu > notebook, Ryacas does not return expressions (just the strings), > and hence > > as.expression( <yacas-result> ) > > always gives NULL and e.g. the demo(Ryacas-Function) > also fails: > > > yacas(expression(deriv(BurrCDF(x,c,k)))) > k*c*x^(c-1)*(x^c+1)^(-(k+1)); > > yy <- yacas(expression(deriv(BurrCDF(x,c,k)))) > > yy > k*c*x^(c-1)*(x^c+1)^(-(k+1)); > > str(yy) > List of 2 > $ : NULL > $ YacasForm: chr "k*c*x^(c-1)*(x^c+1)^(-(k+1));" > - attr(*, "class")= chr "yacas" > > > > I have > > - yacas 1.2.2 (standard ubuntu package)
The latest version of Ryacas on CRAN is 0.2-11 http://cran.r-project.org/package=Ryacas -- Statistics & Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.com ______________________________________________ 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.
