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Why does a for-loop stop at the correct place when you use the same counter name as your upper limit?

Asked by Kathryn Moore on 24 Apr 2018
Latest activity Answered by Ahmet Cecen on 24 Apr 2018
Why does this code work, and display the numbers 1-7, rather than stopping at r=1 or going on infinitely (for each step, r=r and the loop continues)?
r=7;
for r=1:r
disp(r)
end

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1 Answer

Answer by Ahmet Cecen on 24 Apr 2018

Because the upper limit is evaluated at the beginning of the execution when r = 7. If you want the loop condition to be evaluated every time the loop iterates, you need to use a while loop. See even if you did something like this:
r=7;
for r=1:r
r=5;
disp(r)
end
You would still get 7 iterations. However now we are overwriting the iterator so you would only get 5s.

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