Wrapper to FOR loops with progress bar

Question

I like to use a progress bar while running slow for loops. This could be done easily with several helpers, but I do like the tkProgressBar from tcl

Answer 1

If you use the plyr family of commands instead of a for loop (generally a good idea if possible), you get as an added bonus a whole system of progress bars.

R.utils also has some progress bars built into it, and there exist instructions for using them in for loops.