Though I wasn't familiar with this I check the repositories list and 
CRAN (extras) is selected in my installation (R-2.14.1). By the way, 
when trying Ryacas after what seemed to be a successful install, for a 
simple example of

x <- 2
Eval(yacas(expression(x*x)))

I got the following:

[1] "Starting Yacas!"
Error in socketConnection(host = "127.0.0.1", port = 9734, server = 
FALSE,  :
   cannot open the connection
In addition: Warning message:
In socketConnection(host = "127.0.0.1", port = 9734, server = FALSE,  :
   127.0.0.1:9734 cannot be opened

I tried adding yacas to my firewall exceptions but no help.

David

On 1/22/2012 2:08 PM, Duncan Murdoch wrote:
> On 12-01-22 3:56 PM, R. Michael Weylandt wrote:
>> 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/
>
> That build would normally be found automatically by
>
> install.packages("XML")
>
> and it was when I just tried it.  Perhaps David has "CRAN (extras)" 
> disabled in his list of selected repositories?
>
> Duncan Murdoch
>
>>
>> Michael
>>
>> On Sun, Jan 22, 2012 at 3:52 PM, David 
>> Stevens<david.stevens@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.marques@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.stevens@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.
>

-- 
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.stevens@usu.edu




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