On Mon, Apr 9, 2012 at 4:02 PM, Gabor Grothendieck
<ggrothendi...@gmail.com> wrote:
> 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
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.
--
Statistics & Software Consulting
GKX Group, GKX Associates Inc.
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email: ggrothendieck at gmail.com
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