Ryacas

I am having issues with Ryacas errors.  I searched and found this error was
reported in 2006, but nothing since.

It works for me on my Windows Vista laptop.  Suggest you review the
toubleshooting section on the home page
http://ryacas.googlecode.com/#TROUBLESHOOTING

library(Ryacas)

Loading required package: XML

library(Ryacas)
yacas(expression(Factor(x^2-1)))

[1] "Starting Yacas!"
expression((x + 1) * (x - 1))

  yacas("D(x)Sin(x)")

expression(cos(x))

   x <- Sym('x')
  (x+1) * (x-1)

expression((x + 1) * (x - 1))

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