How to update the position of legend with 'Best' Location?

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Aleksander Marek 2016-9-26

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评论： dpb 2016-9-27

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Hi,

I have an output function which I use with fmincon to plot some of variables during optimization process. I use

legend(...,'Location', 'Best')

to define the legend, and in the first iteration it looks really okay. However, as the optimization goes, I update my graph with:

set(h, 'YData', new_data);

And sometimes the legend overlaps with the new plot (it doesn't reposition to adjust for new data). Is there any way I could reposition automatically my legend (I guess apart from deleting it and constructing again every iteration)?

Cheers, Aleksander

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Aleksander Marek 2016-9-27

在 MATLAB Online 中打开

Yesterday, I tried updating the legend's position with:

set(leg, 'Location', 'North')
set(leg, 'Location', 'Best')
drawnow

But the legend wouldn't move at all

dpb 2016-9-27

That's actually what I expected; legend is just an m-file and set on the properties after the fact only changes that string recorded in the 'location' property; it doesn't trigger any callbacks or such.

You'd have to use a callback function when data are updated and that's more trouble than simply re-issuing the legend command each iteration.

While no doubt it's not as neat in appearance, if the redrawing is distracting during the simulation, you could place the legend outside the axes so it won't occlude the data and then try the 'best' location at the end for final viewing.

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