How do you change the transparency of multiple lines using "plot" if the lines are all different colors?

Im trying to plot 15 lines in a single graph. Each line is a different color and would like all of them to be semi-transparent (alpha =0.2). Alpha does not work and when I use the 'Color' [value value value 0.2] it changes all the lines to the same color.

Answer 1

[Les Beckham]

h = plot(rand(5)); % example plot.  When you make your plot be sure to capture the handle
% now set the alpha on all the lines in the plot handle h
for i=1:numel(h)
    c = get(h(i), 'Color');
    set(h(i), 'Color', [c 0.2]);
end
grid on