R: trouble making package Ryacas to work on Windows

Question

I am trying to use the package Ryacas in R. Here what is going on:

> install.packages(\"Ryacas\")
--- Please select a CRAN mirro         


        

Answer 1

One way to zero-in on the problem is to make sure the port is open:

1) Click Windows Start

2) Click All Programs

3) Click Accessories

4) Click Command Prompt to open a DOS window

5) Change the directory to the directory where yacas.exe is located (probably C:\Program Files\yacas\winrel) by typing cd C:\Program Files\yacas\winrel

6) Start yacas with the server by typing yacas --server 9734

7) Yacas should give you the following feedback Accepting requests from port 9734

If everything works up to this point then yacas is running and ready to talk. Now, you can run your R code. If it doesn't work, then you have a problem with yacas.

Answer 2

Two possibilities: 1) Yacas never got started. (R does not load Yacas for you.) 2) The connection was blocked. Assuming you started Yacas from your operating system, then you need to open up that port using your security admin tools. It's not an R issue but an operating system/firewall issue.

I may be wrong about needing to start Yacas from the Start menu. This is the code for:

runYacas()
### You should not need to type any of what follows. Just use the command above.
runYacas <- function(method = "system", yacas.args = "", yacas.init = "") {
   cmd <- yacasInvokeString(method = method, yacas.args = yacas.args, yacas.init = yacas.init)
   if (.Platform$OS.type == "windows") 
      system(cmd, wait = FALSE, invisible = FALSE)
   else system(cmd, wait = FALSE)
}

Since it seems to call the system, I would try that at your R prompt.