Starting a Loop over again

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

Answer 1

[Walter Roberson]

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

[David Koenig]

Thanks for the response.

I had to use

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

to get it to run. I guess I_detected_an_error caused my Matlab to choke.

In any case I don't see how it solves my problem but that is likely because I just don't understand. To address my problem in the meantime, I put the algorithm that I wish to repeat into a function with a error return code. If there is an error I call the function again...it's crude but it will do.

Thanks again.

Dave

[Walter Roberson]

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]

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]

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