Interacting with R GUI app from another Cocoa app

You might try to write the results into a file and read it back in R.  This is probably safer anyway.

This was my initial approach, but I expect a lot of overheads reading an array that can be as large as 100,000,000*10,000*100.

But did you mean that the Cocoa app should save its output as an R workspace? Is it possible to convert and save a C array into its equivalent in an R workspace?

While searching more on the web, I came across a post of someone wanting to export a C++ array to R, and Simon Urbanek replied "the short answer is no, you can't, because the memory has to be allocated by R". But R.app is Applescript enabled, so I should be able to tell R to create an array, and maybe later assign this object to the simulation output.

Why not run the original dyn library simulation as another user, then the current user can do whatever they want with R?  To do this enable "fast user switching" in the "Accounts" preference.  Now you can leave a program running as one user and log in as another user to do something else.  Of course, you will need to create a 2nd user account.

That would work, but that would not be very practicable, for example, I would need as many accounts as simulations I want to run at the same time.

Thanks for your help

Guillaume