CODEWITHSUNDEEP
matlabmatlab-figure
z8080
z8080

Reputation: 659

Matlab legend for two plots only applies to second plot

I need to plot data of two vectors, and want the data points of each to be shown in a different colour that is explaned in a legend. However, the code below displays only the legend for the second one. What am I doing wrong?

for i_plot = 1 : plot_step : N
    subplot(N, 1, i_plot)
    h_A = plot(bookmarksA(i_plot, :),0,'b.','MarkerSize',24);
    legend('a');
    xlim ([0 pieceDuration])
    set(gca, 'yTick', []);
    title(subj_string(i_plot,:))
    hold on
    h_Z = plot(bookmarksZ(i_plot, :),0,'r.','MarkerSize',24);
    legend(h_Z, 'z');
end

enter image description here

Upvotes: 2

Views: 62

Answers (1)

Suever
Suever

Reputation: 65430

You're only passing one label / handle combination to the legend command at a time. For a given axes, each call to legend overrides previous calls to legend, deleting previous legends rather than adding to an existing legend. You'll want to call legend once with both plot handles and labels.

legend([h_A, h_Z], {'a', 'z'})

Update

Since in your case h_A and h_Z are arrays of plot handles with identical appearances, you can just pass the first item from h_A and h_Z to legend.

legend([h_A(1), h_Z(1)], {'a', 'z'})

Upvotes: 2

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