how to plot two variables having different length y1 it's size (1x1500) and y2 (1x1200) at the same figure according to steps in time (X-axis)

I'm actual doning random walk with different lengths and i want every variables has a color like this

Answer 1

[Voss]

% two random vectors of different lengths
y1 = cumsum(randn(1,1500));
y2 = cumsum(randn(1,2000));

% plot them
plot(y1)
hold on
plot(y2)
xlabel('Step #')
ylabel('Position')