[R] Ryacas loads but yacas has an error

Søren Højsgaard sorenh at math.aau.dk
Wed Jun 19 18:24:47 CEST 2013

Dear Erin,

I don't have solution, but there is a remark on connection issues at http://code.google.com/p/ryacas/ 

An alternative could be to look at the rSymPy or rmathpiper packages which may do what you want.


-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Erin Hodgess
Sent: 19. juni 2013 17:50
To: R help
Subject: [R] Ryacas loads but yacas has an error

Hello yet again, R People:

I was working with Ryacas and yacas last night and all was well.

Now this morning, I keep getting the following:

> a <- Sym("a")
> a
Error in summary.connection(x) : invalid connection

When I go to yacas from the command line, it works fine.

Any suggestions, please?

I'm thinking that a port might be open, but here I have:
> showConnections()
     description class mode text isopen can read can write

I'm working with R-3.0.1 on Windows 7.


Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences University of Houston - Downtown
mailto: erinm.hodgess at gmail.com

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