iteration only runs once.

Question

Bert Taekels 2017-11-1

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https://ww2.mathworks.cn/matlabcentral/answers/364457-iteration-only-runs-once

评论： Bert Taekels 2017-11-1

i have a part of the code that calls other functions until a parameter is true. To have a safety i put in a counter that can break out of the iteration if too many iterations don't give a result. I must do something wrong, because after one iteration the process stops, even wile in the workspace the papameter is still 0. Here is the part of my code

    counter = 0;
    for realpositiondetected = true
        (call other functions)
        counter = counter+1;
        if counter >= 25
                disp 'real position was not found in 25 iterations'   
                return
        end
    end

I don't have much programming experience, so i might be an easy fix i'm overlooking

Thanks Bert

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Answer 1

KL 2017-11-1

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https://ww2.mathworks.cn/matlabcentral/answers/364457-iteration-only-runs-once#answer_288819

编辑：KL 2017-11-1

在 MATLAB Online 中打开

...a part of the code that calls other functions until a parameter is true...

You probably want to use while loop and then you need to change the variable realpositiondetected to false and change it to true inside the loop based on the return values of all the other functions. For example,

realpositiondetected = false;
counter = 0;
while ~realpositiondetected
   %call the other functions here
   %check what you want to do is fullfilled
   counter = counter+1;
   if(someReturnValue == whatYouWant)
       realpositiondetected = true;
       break; 
   elseif(counter>=25)
       disp('counter exceeds limit, breaking the loop!')
       break;
   end
end

See I have used break instead of return. Documentation says, If you call the function or script that contains return directly, there is no invoking function and MATLAB returns control to the command prompt.

Also, you can break your loop in case if your realpositiondetected becomes true.

So I'd advise to use break for your purpose. read more here.

https://de.mathworks.com/help/matlab/ref/break.html

https://de.mathworks.com/help/matlab/ref/return.html