Add refline (hline) to the legend

Hello everybody,

I have a simple (?) question. I have been searching on the web for a while now, but wasn't able to find a satisfying solution. I have several subplots where I added different reflines with the following code:

   subplot(2,1,1)
    hold on
    plot(x1, y1,'--r')
    plot(x2, y2,'r','LineWidth',1.5)
    hline = refline([0 threshlod_1]);
    hline.Color = 'k';
    hline.LineStyle = ':';
    hline = refline([0 threshold_2]);
    hline.Color = 'k';
    hline.LineStyle = ':';
    legend('data1','data2')

Now I want to add these reflines to the legends of the subplots.

-> legend('data1','data2','threshold_1','threshold_2')

Do you have any idea how this can be done?

Thank you in advance

cheers

Christian

Answer 1

[Thorsten]

Use handles:

hold on
h(1) = plot(x1, y1,'--r')
h(2) = plot(x2, y2,'r','LineWidth',1.5)
h(3) = refline([0 threshlod_1]);
h(3).Color = 'k';
h(3).LineStyle = ':';
h(4) = refline([0 threshold_2]);
h(4).Color = 'k';
h(4).LineStyle = ':';
legend(h, 'data1','data2','threshold_1','threshold_2')

[Christian]

That Code gives me the following error:

Structure assignment to non-structure object.

Error in my_script(line 681)
    h(3).Color = 'k';

Answer 2

[Samuel Anyaso-Samuel]

This should work.

    subplot(2,1,1)
    hold on
    plot(x1, y1,'--r')
    plot(x2, y2,'r','LineWidth',1.5)
    a = refline([0 threshlod_1]);
    a.Color = 'k';
    a.LineStyle = ':';
    a.DisplayName = 'line a'
    b = refline([0 threshold_2]);
    b.Color = 'k';
    b.LineStyle = ':';
    b.DisplayName = 'line b'
    legend('show')