如何从现有的图例中删除条目？

Question

I have a Matlab figure, let's say it's MyFigure.fig. This figure has 12 curves with its respective legend entries. However, I want to delete one of the curves and its legend. The curve was easy to delete (just selecting it with the cursor and pressing delete), but when I try to delete its legend, I can only delete the name.

I have been looking for this and I have found other ways to do it. I have found helpful the information of the next link

http://es.mathworks.com/help/matlab/creating_plots/controlling-legends.html

but, I cannot carry it out. The main problem I found here is this:

• If I try to do it like this, I have no problems:

   Example (not my case): x=0:0.01:pi; y=sin(x); H=plot(x,y); hAnnotation = get(H, 'Annotation'); 

• But, in my case, I don't have to use "plot" because I have already the figure. So, when I open it and I try to get its handle (by H=gcf or H=gca ) and then, I write the code

   hAnnotation = get(H, 'Annotation'); 

I have the next errors:

1. The name 'Annotation' is not an accessible property for an instance of class 'figure' (in the case of gcf)
2. The name 'Annotation' is not an accessible property for an instance of class 'axes' (in the case of gca)

Answer 1

Well, there are several points in your code, that are going wrong. Coming straight to your problem, that's what I suggest:

As far as I can see, this is the same issue that is asked and answered here , BUT the other way around: instead of adding information, you want to remove entries of the legend. In fact, that is leading to the exact same thing: you want to update the legend. Thus you can use the same method as described in the mentioned question:

If you plot something, use the 'DisplayName'-parameter. In your example, that would be:

plot(x,y, 'DisplayName', 'myNameForThisLineGoesHere');
%now, after you added OR removed a line (etc.), you have to update the legend:
legend('off'); legend('on')