Combining legend data

Question

Steven White 2011-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/711-combining-legend-data

评论： Jeen Doe 2017-5-6

What I would like to do is combine two legend items together. Suppose I have some like the following:

plot(4.5+rand(1,50),'o')
hold on
plot(5*ones(1,50))
legend('data','fit')

But instead of having 2 entries in the legend (1 circles, 1 line) I have only 1 entry (line with circle in the middle).

Does anybody know how to do this?

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Answer 1

Martijn 2011-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/711-combining-legend-data#answer_1046

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What you could do here is first change your code a little to obtain handles to the plot:

p1= plot(4.5+rand(1,50),'o');
hold on
p2 = plot(5*ones(1,50));

Then only add a legend to the second plot (again make sure you obtain a handle):

l = legend(p2,'MyLegend');

Then modify the Marker used in this legend:

c = get(l,'Children');
set(c(1),'Marker','o')

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Martijn 2016-4-6

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The code above is for MATLAB releases before R2014b. For MATLAB release R2014b and newer with the new graphics system, this would become:

p1= plot(4.5+rand(1,50),'ob');
hold on
p2 = plot(5*ones(1,50),'b');
[~,objects] = legend('MyLegend');
objects(2).LineStyle = '-';

Jeen Doe 2017-5-6

在 MATLAB Online 中打开

In 2017a at least, the last line should be

objects(2).Children.LineStyle = '-';

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Answer 2

Walter Roberson 2011-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/711-combining-legend-data#answer_1080

When I try in 2008b Linux 64, I get two legend entries, as I expect.

Are you finding that you only get one legend entry, or are you trying to get only one legend entry? If you are trying to get only one legend entry, what are you hoping that it would look like considering you have two labels and two markers?

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Steven White 2011-8-17

I would only like one entry. The idea here is to represent the circle and the line as the same thing. For example, this could be data (circles) and fitted lines (lines). Hence, if I am plotting multiple datasets and fitted lines, 4 of each say, then I only have 4 legend entries, rather than 8.

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