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How can I ensure that when I click the play button more than once in my MATLAB GUI

  How can I ensure that when I click the play button more than once in my MATLAB GUI, the audio is played only once, regardless of how many times I press the play button? I am making an audio equalizer in MATLAB guide. When I press the 'play' button more than once, it plays the audio signal as many times as I've pressed the button. What I want is that when I press the play button more than once, it should only play the audio signal once.   The code for play button is given below:   % PLAY BUTTON function pushbutton2_Callback(hObject, eventdata, handles) % hObject handle to pushbutton2 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) audiofile = handles.fullpathname; % the input audio file is stored in "audiofile" variable. [x, fs] = audioread(audiofile); guidata(hObject, handles); handles.CP=1; % Storing the value of slider in respective variables. slider_1 = get(

what algorithms are applied in the auto tuning of PID block in simulink?

 Hi everyone,

 
as the title, could anyone tell me about that?
 
The auto tuning really offers a really good control performance.
 
Thanks very much!

NOTE:-


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Typical PID tuning objectives include:
Closed-loop stability — The closed-loop system output remains bounded for bounded input.
 
Adequate performance — The closed-loop system tracks reference changes and suppresses disturbances as rapidly as possible. The larger the loop bandwidth (the first frequency at which the open-loop gain is unity), the faster the controller responds to changes in the reference or disturbances in the loop.
 
Adequate robustness — The loop design has enough phase margin and gain margin to allow for modeling errors or variations in system dynamics.
 
The MathWorks algorithm for tuning PID controllers helps you meet these objectives by automatically tuning the PID gains to balance performance (response time) and robustness (stability margins).

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