[R] Problems with CRAN package Ryacas

[Gabor Grothendieck]

On Mon, Apr 9, 2012 at 2:47 PM, Martin Maechler
<maechler at 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

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