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from Eular angles GUI by Maxim Vedenyov
Eular angles visualization and connection with axis-angle rotation.

arrow_visible_off_on(arr,off_on)
function arrow_visible_off_on(arr,off_on)
% set arrow visible/invisible
if off_on % if visible
    for arrc=1:length(arr)
        set(arr{arrc},'visible','on');
    end
else
    for arrc=1:length(arr)
        set(arr{arrc},'visible','off');
    end
end

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