How do I get the right colors in histogram?

Question

pedro 2016-6-17

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编辑： pedro 2016-6-17

Greetings! I'm having trouble setting histogram bar colors in matlab after 2014a. The following code (using bar), works fine both before and after, meaning that the bars are (bright) red, as expected:

data1=randi(9,4,1); bh=bar(data1) set(bh,'FaceColor',[1,0,0])

The following code (using hist) also produces the desired red bars before (with 2014a):

data2=randi(9,99,1);

hist(data2)

h = findobj(gca,'Type','patch');

set(h(1), 'FaceColor',[1,0,0])

However, in 2015a (the latest I have access to) the following code (using histogram) produces pink bars, not red:

h1=histogram(data2);

h1.FaceColor=[1,0,0];

What am I doing wrong?

I'm still trying to wrap my mind around the new graphics, so any help would be appreciated.

Cheers, pedro

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Answer 1

Steven Lord 2016-6-17

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在 MATLAB Online 中打开

By default, the histogram plot is partially transparent. [That way if you have two of them on the same axes, you can see both of them.] Its FaceAlpha property defaults to 0.6. That's what makes it look more "pink" than red. Change FaceAlpha to 1 to make it opaque, 0 to make it completely transparent.

data2=randi(9,99,1);
h1=histogram(data2);
h1.FaceColor=[1,0,0];
ax = ancestor(h1, 'axes');  % Get the axes handle so I can update the title
for k = 0:100
  h1.FaceAlpha = k/100;
  title(ax, sprintf('FaceAlpha is %d/100', k)); % Show the current FaceAlpha value
  pause(0.1)
end