How can one specify the color of comparison bar chart?

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alpedhuez 2021-7-30

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编辑： alpedhuez 2021-7-30

采纳的回答： dpb

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Suppose I have

bin_age = ['test', 2];
vals = [ 1 1; 2 2];
b = bar(vals)
newXticklabel = {'young', 'old'}
set(gca,'XtickLabel',newXticklabel);
xlabel('Product');

How can one change the colors of the first bars (blues) and the second bars (oranges)?

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dpb 2021-7-30

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Just answered for another a few minutes ago @ <problem-with-grouped-bar-plot>

You also have a grouped bar plot as your data are arranged as a 2x2 array -- so 2 groups of 2 bars/group.

The .CData property is the only way to change individual bars, likewise it's the way to change all bars of the two bar handles because as you've probably already discovered, the 'Color' property in the bar() argument list is applied to every bar globally, and there's no provision to supply a vector of colors to associate with each row (group) on a 1:1 basis.

I've railed at TMW for 30 years about the poor interface to bar() on such things that the implementation is extremely "user-beligerent" as opposed to "user-friendly".