Hi Charlie,
I like your idea of updating an R progress bar from C, but I don't at all
understand how to call txtProgressBar from C. I have looked at Writing R
Extensions and it is equally confusing. Any help would be appreciated.
Thanks!,
Erik
On Apr 5, 2010, at 10:29 AM, Sharpie wrote:
>
>
> Erik Wright wrote:
>>
>> Hello all,
>>
>> I am using Rprintf in a C for loop (from .Call) to print a progress
>> indicator showing the current percent complete. The loop I am doing is an
>> time intensive call to another function. I have noticed that Rprintf does
>> not print to the R-window until the entire loop has been completed. When
>> it reaches the end of the loop it suddenly prints 0 percent to 100 percent
>> in a split second. For less intensive function calls it prints properly
>> while looping. My question is this: is there any way to force Rprintf to
>> print to the screen during a loop?
>>
>> On a related note, how can I show a percent sign in the output? For
>> example, Rprintf("0%"); only prints a zero.
>>
>> Thanks!,
>> Erik
>>
>
> Perhaps you could use a callback to R's built in progress bar functions to
> perform this for you in a nicely formatted way. Something of the form:
>
> pBar <- txtProgressBar( min = , max = , type = 3 )
>
> cResults <- .Call( 'some_c_routine', some, args, including, pBar )
>
> close( pBar )
>
> Since you pass the progress bar to the C routine, you could perform a
> callback to the R function setTxtProgressBar() to update it every iteration.
> I posted an example of how to perform callbacks from C to R in this thread:
>
>
> http://n4.nabble.com/Writing-own-simulation-function-in-C-td1580190.html#a1580423
>
> Hope this helps!
>
> -Charlie
>
> -----
> Charlie Sharpsteen
> Undergraduate-- Environmental Resources Engineering
> Humboldt State University
> --
> View this message in context:
> http://n4.nabble.com/Rprintf-not-updating-tp1751703p1751725.html
> Sent from the R help mailing list archive at Nabble.com.
>
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