Why won't my script (using for loops) loop and plot all 3 values?

My script is supposed to plot three graphs, each using a value of k, and loop through these values. Once run, it should plot a graph and then be able to produce the other two graphs subsequently (when any key is pressed). However, it currently remains 'paused' and no graph is produced. What should I do? Here is my script:

    for k = [2.9, 3.5, 3.9]
        %clear figure, and the vector a
    clf; clear a;
%set up vector a, a_1 = 0.5
    a = zeros(1,50);
    a(1) = 0.5;

    for n = 2:50
        a(n) = k*a(n-1)*(1-a(n-1))
    end

    plot(a);
    title(['k=',num2str(k)]);

    %pauses the loop and waits
    % for any key press to continue
    pause; 
end

Answer 1

[KSSV]

figure
hold on
for k = [2.9, 3.5, 3.9]
        %clear figure, and the vector a
%set up vector a, a_1 = 0.5
    a = zeros(1,50);
    a(1) = 0.5;
    for n = 2:50
        a(n) = k*a(n-1)*(1-a(n-1))
    end
    plot(a);
    title(['k=',num2str(k)]);
    %pauses the loop and waits
    % for any key press to continue
    pause; 
end

USe hold on