[R] Forcing a refresh in R for Windows
ligges at statistik.uni-dortmund.de
Wed Sep 26 22:49:20 CEST 2001
On Wed, 26 Sep 2001 Jim_Garrett at bd.com wrote:
> System: Windows NT 4.0 450 MHz Pentium II, R version 1.3.0 (will upgrade
> Is there some way to force the command-line interface to print information
> to the screen before evaluating the next expression? For example, if I put
> the following in a file:
> cat("Select a file\n")
> filename <- file.choose()
> and source the file, I don't see the instruction "Select a file" until
> after I'm done with the dialog box that pops up.
> Another example involves getting updates from an iterative procedure before
> the procedure is done:
> for(i in 1:500)
> # if(i %% 10 == 0)
> cat("iteration ", i, "\n")
> # <something time-consuming here>
> I don't get any update printed to the screen until after the loop is
> completed, which is when I no longer need it. If something causes the
> screen to refresh, such as swapping to another application and back, the
> information is printed. However, is there any kind of programming command
> I can use that will force a printout when I want it?
See section 6.3 in the R-win FAQs.
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