how to fill histogram legend markers

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sani
sani 2021-2-24
回答： Lior de Marcas 2021-8-14
hello,
I'm plotting using histograms, and when I insert legend into the plot, the rectangles are hollow.
I'd like them to be filled but couldn't find any documentation about how to do it.
is it even possible?

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回答（2 个）

KALYAN ACHARJYA
KALYAN ACHARJYA 2021-2-24
编辑：KALYAN ACHARJYA 2021-2-24
I tried to reproduce the same error, I did not get it
data1=randi(10,[1,100]);
data2=randi(10,[1,100]);
histogram(data1,'FaceColor','r');
hold on;
histogram(data2,'FaceColor','b');
legend('Data1','Data2')
Can you confirm it?
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Steven Lord
Steven Lord 2021-2-24
The stairs DisplayStyle draws only the edges of the histogram bars, so the legend also shows only the edges. I don't believe there's a way to make it draw the filled boxes from the default DisplayStyle in the legend while using the stairs DisplayStyle in the axes.
sani
sani 2021-2-24
so the only way is to find alternative way to display the data?

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Lior de Marcas
Lior de Marcas 2021-8-14
Ran in:
Had a similar problem. Probabley not relevant anymore, but you can use "fake" bar chart in order to do that (unfortanatly I don't remember the first post I saw something simillar in to give the deserved credit):
% Plot some stairs histograms:
data1=randi(10,[1,100]);
data2=randi(10,[1,100]);
histogram(data1,'DisplayStyle','stairs');
hold on;
histogram(data2,'DisplayStyle','stairs');
% Get since we didn't specify colors, we use 'auto'. Get the colors from
% the axis color order
% (https://www.mathworks.com/matlabcentral/answers/221889-how-do-i-get-the-facecolor-of-a-histogram-if-set-to-auto).
% If you specified colors, use them instead
colorList = get(gca,'ColorOrder');
% Now Create bar chart with nan so it won't show:
b = bar(nan(2,2)) %2X2 to create two bar charts (2 columns in the matrix == 2 bar charts).
b =
1×2 Bar array: Bar Bar
% The 2 rows is just so it won't create 1 chart for a vector input - there is probably a better way
set(b,{'FaceColor'},num2cell(colorList(1:2,:),2))
legend(b,{'Data1','Data2'})

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