## Starting a Loop over again

### David Koenig (view profile)

on 19 Dec 2012
If I am in a while/end loop and I find that I have a mistake and want to get out of the loop and start the loop over again, how do I do it?
I have tried break but that gets me out of the loop and positions me to go on the next part of the script. Instead, I want to go back and start the loop over again.
Thanks,
Dave

### Walter Roberson (view profile)

on 20 Dec 2012
Edited by Walter Roberson

### Walter Roberson (view profile)

on 20 Dec 2012

continue
as in
c = 0;
while c <= 100
I_detected_an_error = rand() < 0.07;
if I_detected_an_error
disp('LART!')
continue;
end
c = c + 1;
end

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Walter Roberson

### Walter Roberson (view profile)

on 20 Dec 2012
I had a typo in a variable name, oops.
Try this to make it more obvious that the rest of the loop body is being skipped but the loop continues:
c = 1;
while c <= 20
I_detected_an_error = rand() < 0.07;
if I_detected_an_error
disp('LART!')
continue;
else
disp('No LART!')
end
c = c + 1;
end
You might have to run more than once to see a LART.
The output you get will have "No LART" 20 times, with a variable number of LART mixed in. If the rest of the body of the loop was being executed after the "continue" then you would get exactly 20 outputs rather than exactly 20 "No LART". The "continue" is popping it back to the beginning of the loop.
Image Analyst

### Image Analyst (view profile)

on 20 Dec 2012
I think you need to set c = 1 just before the continue if you really want to start the loop all over again from the beginning, instead of just continuing with the next iteration.
Walter Roberson

### Walter Roberson (view profile)

on 20 Dec 2012
Ah, yes, that is a plausible interpretation of the question. Not what I would have guessed, but plausible.