MATLAB Answers

Do while loop in Matlab

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UTS
UTS on 9 Feb 2014
Commented: P Richards on 23 Jul 2019
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
Jan on 9 Feb 2014
This is no valid C++syntax. Do you mean:
do {
<your calculations>
} while (abs(A - B) <= 50)
MathWorks Support Team
MathWorks Support Team on 27 Nov 2018
We updated the question to reflect correct syntax

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Accepted Answer

Mischa Kim
Mischa Kim on 9 Feb 2014
Edited: MathWorks Support Team on 27 Nov 2018
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
UTS on 9 Feb 2014
Thank you very much,
Image Analyst
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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More Answers (2)

Jos (10584)
Jos (10584) on 9 Feb 2014
A do-while loop in disguise:
while true
% statements here
% if ~WhileCondition, break ; end
end
or

  2 Comments

Timothy Mathias
Timothy Mathias on 29 Nov 2018
Nice idea Jos. I modified it a bit for my particular needs.
do = true;
while do
% statements here
% do = result_of_conditions_test;
end
Seyedeh Razieh Hosseini
Seyedeh Razieh Hosseini on 5 Jan 2019
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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Vigneshwar Pesaru
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
P Richards on 23 Jul 2019
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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