[R] Rprintf not updating

[William Dunlap]

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Erik Wright
> Sent: Monday, April 05, 2010 7:59 AM
> To: r-help at r-project.org
> Subject: [R] Rprintf not updating
> 
> 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?

If you are using the Windows GUI for R hit control-W or
toggle the Misc\OutputBuffering menu item.

> On a related note, how can I show a percent sign in the 
> output?  For example, Rprintf("0%"); only prints a zero.

Use %%.

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com 

> 
> Thanks!,
> Erik
> 
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