Do while loop in Matlab

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

[Jan]

This is no valid C++syntax. Do you mean:

do {
  <your calculations>
} while (abs(A - B) <= 50)

[MathWorks Support Team]

We updated the question to reflect correct syntax

Answer 1

[Mischa Kim]

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

[UTS]

Thank you very much,

[Image Analyst]

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.

Answer 2

[Jos (10584)]

A do-while loop in disguise:

while true
   % statements here
   % if ~WhileCondition, break ; end
end

or

[Timothy Mathias]

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]

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?

[David Michelman]

How so? Since do always starts out as true, you only have to write out the calculation once?

Answer 3

[Marco Ottina]

My suggestion is using the following pattern:

canContinue = true;
while canContinue
    % do your code here
    
    canContinue = condition_of_the_do_while ; % insert here your condition
end

Answer 4

[Vigneshwar Pesaru]

Hi!!!

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

[P Richards]

IHMO The absence of do while makes some coding more difficult than it needs to be:

do

theConditionStillExists=attemptToFixIt();

while theConditionStillExists