How do I use only one legend entry for sets of xlines?

I am currently trying to create a plot with two sets of xlines, with one set colored red and the other colored green. For some reason, when I plot them, the legend entry shows that both lines are identified as green. I'm not sure how to go about fixing this issue, so any help would be greatly appreciated! Attached is the code I'm using as well as an image with the problem.

for trialNumber = 1:length(filenameDataAC)
        legendNames = {"Accelerometers","Motion Capture","Upper Threshold (UT)","Lower Threshold (LT)","Stim On","Stim Off"};
        fig = figure('Name', dataStoreACFTrunc{trialNumber,1});
    
        % Pitch (NNP+VIC)
        subplot(3,1,1)
        plot(dataStoreACFTrunc{trialNumber,2}.time, dataStoreACFTrunc{trialNumber,2}.Pitch)
        hold on
        plot(intDataStoreVICFTrunc{trialNumber,2}.time, intDataStoreVICFTrunc{trialNumber,2}.Pitch)
        set(gca, 'FontSize', 16, 'FontWeight', 'bold')
        xlabel('Time (s)', 'FontSize', 18)
        ylabel('Pitch Angle (deg)', 'FontSize', 18)
        yline(pUTs(trialNumber),'-','UT','LabelHorizontalAlignment','left')
        yline(pLTs(trialNumber),'-','LT','LabelHorizontalAlignment','left')
        x1 = xline(dataStoreACFTrunc{trialNumber,2}.time(stimOn{trialNumber}),'--','Color','g');
        x2 = xline(dataStoreACFTrunc{trialNumber,2}.time(stimOff{trialNumber}),'--','Color','r');
        ylim([-60,60])
        yticks([-60,-30,0,30,60])
        xlim([0 dataStoreACFTrunc{trialNumber,2}.time(end)])
        legend(legendNames)
        
        % Roll (NNP+VIC)
        subplot(3,1,2)
        plot(dataStoreACFTrunc{trialNumber,2}.time, dataStoreACFTrunc{trialNumber,2}.Roll)
        hold on
        plot(intDataStoreVICFTrunc{trialNumber,2}.time, intDataStoreVICFTrunc{trialNumber,2}.Roll)
        set(gca, 'FontSize', 16, 'FontWeight', 'bold')
        xlabel('Time (s)', 'FontSize', 18)
        ylabel('Roll Angle (deg)', 'FontSize', 18)
        yline(rUTs(trialNumber),'-','UT','LabelHorizontalAlignment','left')
        yline(rLTs(trialNumber),'-','LT','LabelHorizontalAlignment','left')
        xline(dataStoreACFTrunc{trialNumber,2}.time(stimOn{trialNumber}),'--','Color','g')
        xline(dataStoreACFTrunc{trialNumber,2}.time(stimOff{trialNumber}),'--','Color','r')
        ylim([-60,60])
        yticks([-60,-30,0,30,60])
        xlim([0 dataStoreACFTrunc{trialNumber,2}.time(end)])
    
        % Controller Stim State
        subplot(3,1,3)
        plot(dataStoreACFTrunc{trialNumber,2}.time, dataStoreACFTrunc{trialNumber,2}.StimState)
        set(gca, 'FontSize', 16, 'FontWeight', 'bold')
        xlabel('Time (s)', 'FontSize', 18)
        ylabel('Stim State', 'FontSize', 18)
        xline(dataStoreACFTrunc{trialNumber,2}.time(stimOn{trialNumber}),'--','Color','g')
        xline(dataStoreACFTrunc{trialNumber,2}.time(stimOff{trialNumber}),'--','Color','r')
        ylim([0,5])
        xlim([0 dataStoreACFTrunc{trialNumber,2}.time(end)])
    
        sgtitle('Return to Upright Controller Outputs', 'FontSize', 32, 'FontWeight', 'bold')
        % saveas(fig, dataStoreAC{trialNumber,1},'fig')
        % figsPath = dir(fullfile(currentPath,'*.fig'));
        % movefile(fullfile(figsPath.folder,figsPath.name),saveFigPath);
end

Thank you!

Answer 1

[Voss]

One way is to explicitly state which line objects to put in the legend, in the call to legend. For example:

        subplot(3,1,1)
        h1 = plot(dataStoreACFTrunc{trialNumber,2}.time, dataStoreACFTrunc{trialNumber,2}.Pitch);
        hold on
        h2 = plot(intDataStoreVICFTrunc{trialNumber,2}.time, intDataStoreVICFTrunc{trialNumber,2}.Pitch);
        set(gca, 'FontSize', 16, 'FontWeight', 'bold')
        xlabel('Time (s)', 'FontSize', 18)
        ylabel('Pitch Angle (deg)', 'FontSize', 18)
        y1 = yline(pUTs(trialNumber),'-','UT','LabelHorizontalAlignment','left');
        y2 = yline(pLTs(trialNumber),'-','LT','LabelHorizontalAlignment','left');
        x1 = xline(dataStoreACFTrunc{trialNumber,2}.time(stimOn{trialNumber}),'--','Color','g');
        x2 = xline(dataStoreACFTrunc{trialNumber,2}.time(stimOff{trialNumber}),'--','Color','r');
        ylim([-60,60])
        yticks([-60,-30,0,30,60])
        xlim([0 dataStoreACFTrunc{trialNumber,2}.time(end)])
        legend([h1(1),h2(1),y1(1),y2(1),x1(1),x2(1)],legendNames)

[Matthew]

That seems to have done the trick, thank you for your help with this!

[Voss]

You're welcome!