Hold on in for loop doesn't work

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I want to plot several curves using a for loop, but hold on doesn't work.

I also tried to set the property of 'axis' (i.e. see below 'figure()') but it doesn't work.

The only thing that I could do is hardcoding the number of the figure (i.e. see above figure(1)).

for ii = 1:5
    d = dlmread([data{ii} '\simulation_results.txt'],'\t',delLine,0);
    ang = d(:,2);
    y = d(:,featCol);
    
    % Consider only the last shaft revolution
    ang = ang-(ang(end)-360);
    y = y(ang>0);
    ang = ang(ang>0);
    
    % figure(1)
    figure()
    % set(gca,'NextPlot','add')
    plot(ang,y,'linewidth',1.5)
    hold on; grid on;  