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

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NeGM
NeGM 2022-9-28
评论： Walter Roberson 2023-5-4
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.

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Les Beckham
Les Beckham 2022-9-28
编辑：Les Beckham 2022-9-28
Ran in:
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
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Les Beckham
Les Beckham 2023-5-4
Interesting. You're right, it doesn't work in a Live Script.
I would report that as a bug. Scroll down to the bottom of this page and click the "Contact Support" link under the Get Support heading.
Walter Roberson
Walter Roberson 2023-5-4
the ability to add transparency to line objects is undocumented, and has some notable restrictions:
  • does not work for Livescript
  • transparency is not saved if you save to a .fig
  • an implication of the above is that transparency of this kind is not saved if you pass graphic objects to or from parallel workers or background pools.

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