How to set legend for a line segment?

How to add legend to this?: line([x1 x2],[y1,y2],'color','r','linestyle','--');

Answer 1

[Thorsten]

 x1 = 10; x2 = 20; y1 = 12; y2 = 34;
 line([x1 x2],[y1,y2],'color','r','linestyle','--');
 legend('my dashed red line')

[Mr M.]

Yes, but I want to use it in general. For example I have plot; plot; line; plot; hist; line; plot; bars; etc. And how to add legend to the lines?

[Thorsten]

h = line([x1 x2],[y1,y2],'color','r','linestyle','--');
legend(h, 'my dashed red line')

If this does not the job, please post a minimal working example of what you try to do and what goes wrong.