legend with multiple axes using yyaxis

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Nathan Bblanc 2021-1-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/707198-legend-with-multiple-axes-using-yyaxis

评论： Star Strider 2023-2-3

采纳的回答： Star Strider

I am creating a plot with two different y axes. the curves are added alternately. for example:

yyaxis left

plot(A)

yyaxis right

plot(B)

yyaxis left

plot(C)

yyaxis right

plot(D)

My problem is that when I add a legend to the plot, the order of the curves is not the order in which they were created. instead, they are ordered first by the left axis

and then by the right axis. meaning if i write down "legend(A,B,C,D)" the legend entry B will correspond with the curve C and vice-versa. is there a way to fix this? The actual case there are more than 4 curves, and the number changes every time, so manual changing is not possible. many thanks in advance

Nathan

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采纳的回答

Star Strider 2021-1-2

6
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/707198-legend-with-multiple-axes-using-yyaxis#answer_589388

编辑：Star Strider 2021-1-2

在 MATLAB Online 中打开

Try this:

A = rand(1,10);
B = rand(1,15);
C = rand(1,20);
D = rand(1,30);
figure
hold on
yyaxis left
ha = plot(A);
yyaxis right
hb = plot(B);
yyaxis left
hc = plot(C);
yyaxis right
hd = plot(D);
hold off
legend([ha,hb,hc,hd], 'A','B','C','D')

Alternatively:

figure
yyaxis left
ha = plot(A);
hold on
hc = plot(C);
hold off
yyaxis right
hb = plot(B);
hold on
hd = plot(D);
hold off
legend([ha,hb,hc,hd], 'A','B','C','D')

Using hold is the only way to do what you want. This cannot be used with your posted code, because without the hold function, the second calls to yyaxis left and yyaxis right calls eliminate the handles to the previously plotted curves.

EDIT — (2 Jan 2021 at 17:41)

Added alternative code.