MATLAB: Legend is not working!

legend

I think I have a simple problme. I have 4 plots in my code as you can see, however, it seems that Legend does not recognize my last plot.
Screen Shot 2019-01-25 at 8.13.51 PM.png

Best Answer

plot(I,repmat(12,1,numel(I)),'-rx')
plot(repmat(0.1,1,numel(V3)),V3,'-bo')