How can I interrupt a for or while loop by pressing a button 2?

Hi everyone! I have a GUI that populates an excel sheet through a for loop. This for loop I activate through a button 1. However, I am trying to add a button 2 that stops the for loop and that shows a text in the command window through disp () but this button 2 does not work until I lock the loop with Ctrl + C in the command window. Once the loop has been stopped manually and not through the button, the queued messages are seen in the command window. QUESTION: Can someone help me to interrupt the loop through button 2? Thank you very much in advance!

    properties (Access = public)
        num_anterior
        txt_anterior
        raw_anterior
        
        num_anterior2
        txt_anterior2
        raw_anterior2
        datos2
        nombre2
        
        bloqueo = 1;
    end
        
   for l=1:height(ficheroAnterior)
        bloqueo = app.bloqueo;
        if bloqueo == 1
            PrPres = [];
            [rowPrPres, colPrPres] = find(string(raw_actual(:,precioArellenar))==string(ficheroAnterior(l,1)));
            PrPres = str2num(ficheroAnterior(l,2));
            for r=1:length(rowPrPres)
                Rango = strcat(columnaExcelaRellenar,string(rowPrPres(r)));
                writematrix(PrPres,app.datos2,'Range',Rango);
                l
            end
        else
            break
        end  
   end
   
    function PararejecucionButtonPushed(app, event)
        app.bloqueo = 0;
        disp("paro ejecucion")
    end

Answer 1

[Rik]

You can tell Matlab to process callbacks with the drawnow function.

If you put a call to drawnow just before you reload the value of your flag, the callback to the stop button will be processed and the value of the flag set to 0.

[Cristian Tacoronte]

Perfect !! Thank you very much, it works perfectly: D