use key to control interactions in loop in matlab

You can use the waitforbuttonpress function in MATLAB to detect a key press during execution of a loop. Here's an example code snippet that demonstrates this:

main.m
% initialize key to empty
key = '';

while true
    % your loop code here
    disp('Running loop...')
    
    % check for key press
    if ~isempty(key)
        disp(['Key pressed: ' key])
        
        % reset key to empty
        key = '';
        
        % handle key press
        if strcmp(key, 'q')
            disp('Exiting loop...')
            break;
        end
    end
    
    % detect key press and set key variable
    [~, ~, key] = KbCheck;
end
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In this example, the loop will continue running indefinitely until a key is pressed. The KbCheck function is used to detect key presses, and the waitforbuttonpress function waits until a key is pressed before continuing execution. Once a key is pressed, the loop checks the value of the key variable and takes appropriate action based on its value. In this example, pressing "q" will exit the loop.