[R] How to check if R.app is running?

[Duncan Murdoch]

On 13-01-20 4:51 PM, Nick Matzke wrote:
> Hi, here's an obscure question someone can hopefully help with.
>
> I have some R code that uses stuff from parallel (now a part
> of the R core in 2.15 I believe), especially clusterApply.
> However, this seems to cause problems in R.app, and I've
> seen advice to not use these multicore functions, e.g. doMC,
> in R.app.
>
> So, I want to make this optional.  How can have a program
> check whether or not it is running in R.app or regular R?
>
> Thanks so much for your help!!
> Nick
>
> PS: I saw this:
> http://stackoverflow.com/questions/2020790/r-script-determine-whether-the-script-is-run-in-the-gui-or-from-command-line
>
> Which says to use:
>
> interactive()
>
> ...but that doesn't work.  Interactive R is fine (e.g.
> starting R from Mac Terminal), only R.app is not.
>
>

.Platform$GUI will be different in the two cases:  "AQUA" for R.app and 
something else in other cases.  I don't know if that's a good test to 
find out if clusterApply is safe.

Duncan Murdoch