running parallel loop until a variable or event

Hi guys, I'm trying to make a button blink every time just when a varriable or event change:

function blink(hObject, eventdata, parent_GUI)
 handles = guidata(parent_GUI);
 parfor i=1:3
     if get(handles.boton_circulo_visible_in,'Value')==0
         i=i-1;
     end
    set(handles.CONECTAR,'ForegroundColor',[1,1,1]);
    disp('prendido')
    pause(0.5)
    set(handles.CONECTAR,'ForegroundColor',[0,0,0]);
    disp('apagado')
    pause(0.5)
 end   

I tried with parfor loop but it say show me an error " changing the loop index is invalid inside a parfor loop iteration". So i loop up abaout other parallel loop like spmd, but also it executes only single time. I dont know what can i do to make that iterative until a variable change

Thanks

Answer 1

[Ronit]

Hello Juan,

The error you're encountering is since parfor does not allow modification of the loop index within the loop body. Additionally, parfor is intended for parallel execution, which might not be necessary for your blinking button functionality. Instead, you can use a while loop to continuously check the variable's value and blink the button accordingly.

function blink(hObject, eventdata, parent_GUI)
    handles = guidata(parent_GUI);
    
    while true
        % Check the condition to continue blinking
        if get(handles.boton_circulo_visible_in, 'Value') == 0
            % Button is off, keep blinking
            set(handles.CONECTAR, 'ForegroundColor', [1, 1, 1]);
            disp('prendido');
            pause(0.5);
            
            set(handles.CONECTAR, 'ForegroundColor', [0, 0, 0]);
            disp('apagado');
            pause(0.5);
        else
            % Button is on, stop blinking
            break;
        end
    end
end

I hope it helps your query!