[R] Problems with CRAN package Ryacas

[Gabor Grothendieck]

On Mon, Apr 9, 2012 at 4:02 PM, Gabor Grothendieck
<ggrothendieck at gmail.com> wrote:
> 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

and the version of yacas supported by Ryacas is:

> yacas("Version()")
expression("1.0.63")

The troubleshooting section on the home page that I referred to does
mention this.

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