task3.m

function task3(file_u, file_ud, file_z, file_ro)
    [x, u] = textread(file_u, "%f %f");
    [x, ud] = textread(file_ud, "%f %f");
    [s, z] = textread(file_z, "%f %f");
    [alpha, ro] = textread(file_ro, "%f %f");
    figure();
    grid on;
    hold on;
    plot(x,u,'r');
    plot(x,ud,'b');
    figure();
    grid on;
    hold on;
    plot(s,z);
    figure();
    grid on;
    hold on;
    plot(alpha,ro);
end