Why don't the markers have the correct color in the legend?

Question

Laura Gianolio 2023-6-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1980244-why-don-t-the-markers-have-the-correct-color-in-the-legend

评论： Laura Gianolio 2023-6-13

If you run this code you will understand what I mean by my question.

I would like that in the legend also the circles had the correct color, otherwise I would rather remove them altogether, leaving only the names.

A1 = randi(10, [5 5]);

B1 = randi(10, [5 5]);

A2 = randi(10, [5 5]);

B2 = randi(10, [5 5]);

scatter(A1,B1,'g');

hold on

grid on

scatter(A2,B2,'b');

title('TEST');

xlabel('X','FontSize',8,'FontWeight','bold');

ylabel('Y','FontSize',8','FontWeight','bold');

legend({'\color{green}G1','\color{blue}G2'},'Location','northwest');

savefig('./Figures/Test')

Error using save
Cannot create 'Test.fig' because './Figures' does not exist.

Error in matlab.graphics.internal.figfile.FigFile/write (line 33)
save(obj.Path, obj.MatVersion, '-struct', 'SaveVars');

Error in savefig (line 83)
FF.write();

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Answer 1

Les Beckham 2023-6-8

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https://ww2.mathworks.cn/matlabcentral/answers/1980244-why-don-t-the-markers-have-the-correct-color-in-the-legend#answer_1252629

编辑：Les Beckham 2023-6-8

在 MATLAB Online 中打开

The problem is that each of your calls to scatter is creating five separate sets of data for a total of 10 sets. But, you only request the legend to be displayed for the first two.

From the documentation:

To plot multiple sets of coordinates on the same set of axes, specify at least one of x or y as a matrix.

To illustrate what I mean, here is your example, but displaying the legend for all of the sets of data:

A1 = randi(10, [5 5]);

B1 = randi(10, [5 5]);

A2 = randi(10, [5 5]);

B2 = randi(10, [5 5]);

scatter(A1,B1,'g');

hold on

grid on

scatter(A2,B2,'b');

title('TEST');

xlabel('X','FontSize',8,'FontWeight','bold');

ylabel('Y','FontSize',8','FontWeight','bold');

legend

Depending on what you really are trying to do, you might just need to reshape or redefine your data as vectors instead of matrices.

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Answer 2

VBBV 2023-6-8

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1980244-why-don-t-the-markers-have-the-correct-color-in-the-legend#answer_1252639

编辑：VBBV 2023-6-8

在 MATLAB Online 中打开

A1 = randi(10, [5 5]);

B1 = randi(10, [5 5]);

A2 = randi(10, [5 5]);

B2 = randi(10, [5 5]);

h1=scatter(A1,B1,'g');

hold on

grid on

h2=scatter(A2,B2,'b');

title('TEST');

xlabel('X','FontSize',8,'FontWeight','bold');

ylabel('Y','FontSize',8','FontWeight','bold');

legend([h1(1),h2(1)],{'G1','G2'},'Location','northwest');

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VBBV 2023-6-13

@Laura Gianolio, Do you mean to display legend with the empty markers but still having the text colored ii.e. green and blue ?

Laura Gianolio 2023-6-13

Exactly, that's what I wanted to say! Because for each dataset I use markers of different shape (to distinguish between different secondary datasets) but of the same color, so I want to identify the datasets in the legend only with the names of the right color.

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