On Jan 4, 2011, at 11:41 AM, Robert Lowe wrote:
> Hi,
>
> I am currently writing an extension for R and have the need to include some C
> code. If I call the code with a large amount of data then it can take several
> minutes to complete.
>
> The C code prints out after a certain iteration hence letting the user know
> it hasn't crashed.
>
> When running in R this generally does not happen and all is printed out at
> the end once the program has completed successfully.
>
> I am using Rprintf() to print out the required output.
>
> e.g. Something simple which illustrates my point
>
> for(int i=0; i<10000; i++){
> #Calculations
> if (i%1000==0){
> Rprintf("Step %d\n",i)
> }
> }
>
> All I get during the program is the OS X spinning wheel in R. Is there any
> way to print out as the program is running?
>
You want to add R_CheckUserInterrupt(); so that the system has a chance to run
the event loop and thus display the result. But the implication is that you may
be interrupted so make sure R controls any memory allocations you have made.
Cheers,
Simon
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