Ryacas library in R does not work

Question

install.packages(c("Ryacas))

was used to install the library in R. No issued in installation and md5 was fine. All necessary package were installed.

library(Ryacas)

yields

Loading required package: XML

x <- Sym("x") Limit(sin(x)/x, x, 0)

for example, however, yields

[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

What do I need to do to get this library to run, on windows XP, using standard R, via Rstudio front end?

By the way, why do these ports need to be open?

Make sure you aren't running a firewall on your machine that blocks those ports. — Joshua Ulrich, Dec 14 '13 at 15:30
Read the Troubleshooting section on the Ryacas home page. Maybe you installed Ryacas but not yacas? — G. Grothendieck, Dec 14 '13 at 16:43

damienfrancois · Accepted Answer · 2013-12-14T18:07:32.147

3

Ryacas is (quoting)

An interface to the yacas computer algebra system.

so it expects yacas to be installed and up and running. It does not install yacas itself just the R libraries needed to use it through R.

The library offers a script to install yacas on your computer ; it is name yacasInstall (See page 9 of the manual)

Running ?yacas should give you more information.

Also, do not forget to actually start yacas by running yacas --server 9734 in the directory where yacas was installed.

edited Dec 14 '13 at 18:07

answered Dec 14 '13 at 17:57

damienfrancois

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See also [this other SO question](http://stackoverflow.com/questions/8794614/r-trouble-making-package-ryacas-to-work-on-windows) – damienfrancois Dec 14 '13 at 18:10

Ryacas library in R does not work

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