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UTS
0

Do while loop in Matlab

Asked by UTS
on 9 Feb 2014
Latest activity Commented on by P Richards on 23 Jul 2019 at 17:01
Could you please let me know the Matlab code that is similar to C++ code as shown below:
do {
<your calculations>
} while (abs(A - B) <= 50)
Thanks

  2 Comments

Jan
on 9 Feb 2014
This is no valid C++syntax. Do you mean:
do {
<your calculations>
} while (abs(A - B) <= 50)
We updated the question to reflect correct syntax

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3 Answers

Mischa Kim
Answer by Mischa Kim
on 9 Feb 2014
Edited by MathWorks Support Team on 27 Nov 2018
 Accepted Answer

There is no 1-to-1 correspondence to the C++ do while loop in MATLAB. Your best option is to use a while loop. The difference is that while loops check the condition at the beginning of the loop while do while loops check the condition at the end of the loop.
while (abs(A-B) <= 50)
...
end
To check the condition at the end of the loop using a while loop, use an if statement inside the while loop:
while 1
<your calculations>
if ~(abs(A - B) <= 50)
break;
end
end

  2 Comments

UTS
on 9 Feb 2014
Thank you very much,
Image Analyst
on 9 Feb 2014
Please mark his answer as "Accepted" so we know that we don't need to look at it anymore and he gets credit for it.

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Jos (10584)
Answer by Jos (10584)
on 9 Feb 2014

A do-while loop in disguise:
while true
% statements here
% if ~WhileCondition, break ; end
end
or

  2 Comments

Nice idea Jos. I modified it a bit for my particular needs.
do = true;
while do
% statements here
% do = result_of_conditions_test;
end
The problem here is that you have to calculate twice. our calculation have to be done once before the loop and again inside the loop. that leads to repetition of a part of a code. what should we do in such a case?

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Answer by Vigneshwar Pesaru on 17 Sep 2017

Hi!!!
There is no 'do while' loop in MATLAB in fact you can perform the similar action using 'while' which is powerful in MATLAB

  1 Comment

P Richards on 23 Jul 2019 at 17:01
IHMO The absence of do while makes some coding more difficult than it needs to be:
do
theConditionStillExists=attemptToFixIt();
while theConditionStillExists

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