how to stop changing of a variable?

Function ...
    ...
    if s<200
    logic=1;
    else
    logic=0;
    end
    end
    end

here I'll explain what I tryna make, assume 's' is a variable result of that firstly starting from 0 and having cumulative summation step by step. Till it arrives at 200, logic equals to 1, so far so good, where it arrives at 200, I want the logic be constant 0 always after at 200, the problem is 's' is decreasing after it got hit by 200. So that it starts to be '1' again. That's the thing I don't want it to be. If it happened in a loop, I'd use 'break', but loops is not used.

For any help, I thank you for your time in advance.

Answer 1

[Stephen23]

Use a nested function:

logic = true;
...
    function ...
    ...
    logic = logic && s<200;
    ...
    end
...

Or a persistent variable:

https://www.mathworks.com/help/matlab/ref/persistent.html

[Enez Furkan Cihan]

It makes no difference, for example, s arrived at 200, logic became 0, but whenever code goes to the beginning of the function and s decreases below 200, logic will be 1 again.

[Stephen23]

@Enez Furkan Cihan: your explanations are not very clear (e.g. what does " whenever code goes to the beginning of the function" actually mean?), but apparently you are calling this function multiple times and expect the logic value to depend on its value in previous function calls. In that case, you need to store the value using persistent or use a nested function. My answer shows how to do this using a nested function.

[Image Analyst]

Yes, how can it go back to the beginning of the function when you said " but loops is not used."???

Can you post a fully working simplified version of your program?

[Enez Furkan Cihan]

@Stephen Cobeldick , I did solved the problem using persistent. For other people possible may have the same problem I had, I forgot to mention the code is in MATLAB Function in Simulink, and function is called multiple times naturally. Any way, It’s done.

[Stephen23]

@Enez Furkan Cihan: I am glad that my suggestion of using peristent helped you. You can help me by voting for my answer or accepting it.

Answer 2

[Image Analyst]

Instead of this

if s<200
    logic=1;
else
    logic=0;

do this

logic = s < 200; % Just one line, not a whole if/else block.
if logic
    return;  % Exit out of the function entirely so s does not get altered anymore.
end

[Enez Furkan Cihan]

Function is not only set up for this logic part. I can't go out of the function before it completes its sampling time.