FAQ
I'm not able to replicate using the same setup on several computers, either with R.app or R running in the terminal, so it's likely something highly specific to your setup. I'd suggest reinstalling or upgrading R and see if the problem goes away.

The clearer way to do this in R, in my opinion, is to use the waitúLSE flag in system(), which has the same effect as & directly in the shell.

Noah
On Mar 6, 2011, at Mar 6 10:29 AM , Dennis Fisher wrote:

Colleagues

I just encountered an odd problem with the system command; perhaps someone can provide some insight.
At some point in the past (~ 6 months ago; I was using the latest version of R and Snow Leopard available at the time), the command:
system("open -a /complete/path/to/app /complete/path/to/file &")
ran successfully.

I am using R 2.12.0 and OS X.6.6 and the command failed. To my surprise, removed the ampersand fixed the problem. I don't know if the problem lies with OS X or R's interaction with OS X. Does anyone have any insights into this?

Dennis


Dennis Fisher MD
P < (The "P Less Than" Company)
Phone: 1-866-PLessThan (1-866-753-7784)
Fax: 1-866-PLessThan (1-866-753-7784)
www.PLessThan.com

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