I'm having trouble loading Ryacas.  I've downloaded and extracted Ryacas
0.2-9 (also tried Ryacas ) and yacas 1.0.63, have the latest version of R
and have tried the following (this works for installing other packages):

install.packages("Ryacas")
library(Ryacas)
install.packages("yacas")
library(yacas)

and get this:
Warning message:
package ‘yacas’ is not available (for R version 2.15.2)

Got the same thing for R version 2.15.1.

Suggestions?  I'm fairly new to R and could use some detailed
instructions.  Working on Mac OSx 10.8.2

Thanks!
-- 
Alicia Ellis
Postdoc
Gund Institute for Ecological Economics
University of Vermont
617 Main Street
Burlington, VT  05405
(802) 656-1046
http://www.uvm.edu/~aellis5/
 <http://entomology.ucdavis.edu/faculty/scott/aellis/>

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