R: Text progress bar in for loop

Question

I have some sample code which contains a for loop and creates some plots like this (my actual data creates several thousands of plots):

xy <- structure(li         


        

Answer 1

for progress bar to work you need a number to track your progress. that is one of the reasons as a general rule I prefer using for with (i in 1:length(ind)) instead of directly putting the object I want there. Alternatively you'll just create another stepi variable that you do stepi = stepi + 1 in every iteration.

you first need to create the progressbar object outside the loop

pb = txtProgressBar(min = 0, max = length(ind), initial = 0) 

then inside you need to update with every iteration

setTxtProgressBar(pb,stepi)

or

setTxtProgressBar(pb,i)

This will work poorly if the loop also has print commands in it