Question

I have the following code:

for(n in 1:1000){
    ..............
}

This will run ............ 1000 times. I havent put the full code in because its extremely long and not relevant to the answer

My question is there any way i can get the code to run until it reaches a specified convergence value to four decimal places. There are initial values being fed into this equation which generates new values and the process is continually iterative until a convergence attained (as specified above).

EDIT

I have a set of 4 values at the end of my code with different labels (A, B, C, D). Within my code there are two separate functions when each calculate different values and feed each other. So when i say convergence, i mean that when function 1 tells function 2 specific values and it calculates new values for A, B, C and D and the cycle continues and the next time these values are the same in as calculated by function 2

The key question im asking here is what format the code should take (the below would suggest that repeat is perferrable) and how to code the convergence criteria correctly as the assignment notation for successive iterations will be the same.

Answer 1

Just making an answer out of my comment, I think often repeat will be the best here. It doesn’t require you to evaluate the condition at the start and doesn’t stop after a finite number of iterations (unless of course that is what you want):

repeat
{
 # Do stuff
 if (condition) break
}