How to make errorbar transparent?

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supernoob
supernoob le 24 Juil 2019
Modifié(e) : David Saidman le 22 Avr 2021
How can I make a plot with discrete errorbar points which are transparent?
  4 commentaires
Adam Danz
Adam Danz le 25 Juil 2019
Modifié(e) : Adam Danz le 25 Juil 2019
Here's an alternative that will take a little work. You could create a function that has the same inputs as errorbar(). In that function you can create vertical lines that span from the lower to upper error limits for each point. That you're dealing with line objects and you'll be able to control their alpha values by adding an alpha value to the 4th position of the RGB color value.
h = plot();
h.Color = [h.Color, 0.5]; % for 50% transparency
Gino Delfe
Gino Delfe le 3 Sep 2020
it works for plot, but not when you use it on the function errorbar()

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Adam Danz
Adam Danz le 3 Sep 2020
Modifié(e) : Adam Danz le 3 Sep 2020
Unlike many line plots, the color property cannot be used to set transparency in errorbar().
Transparency can be set from within the hidden Bar and Line objects that represent the errorbars and trend line, respectively.
% Plot errorbars
cla
hold on
plot(rand(20),rand(20)*2-.5, 'yo', 'MarkerFaceColor', 'k', 'MarkerSize', 15, 'LineWidth', 1.5);
h = errorbar(linspace(0,1,5), linspace(0,1,5), .5*ones(1,5), 'r', 'LineWidth', 10);
% Set transparency level (0:1)
alpha = 0.65;
% Set transparency (undocumented)
set([h.Bar, h.Line], 'ColorType', 'truecoloralpha', 'ColorData', [h.Line.ColorData(1:3); 255*alpha])
  2 commentaires
David Saidman
David Saidman le 21 Avr 2021
Modifié(e) : David Saidman le 22 Avr 2021
This worked.
The end caps on the errorbar were still solid, but I was able to make them transparent with other undocumented properties in the errorbar object. In case someone else may be trying to do the same thing:
The hidden properties h.CapH and h.MarkerHandle can be adjusted the same way as h.Line and h.Bar as above, but use FaceColorData & FaceColorType and EdgeColorData & EdgeColorType properties in place of ColorData & ColorType (or can be set to 'visible','off').
Adam Danz
Adam Danz le 21 Avr 2021
Modifié(e) : Adam Danz le 21 Avr 2021
Thanks for the addition, @David Saidman.
Unless there's something I'm missing, the FaceColor does not need changed for the caps. The transparency can be set in the EdgeColorData and EdgeColorType of the Cap handle.
set(h.Cap, 'EdgeColorType', 'truecoloralpha', 'EdgeColorData', [h.Cap.EdgeColorData(1:3); 255*alpha])

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