Can not make Legend border visible

With the code below. This the example code from https://www.mathworks.com/help/matlab/ref/legend.html

x = linspace(0,pi);
y1 = cos(x);
plot(x,y1)

hold on 
y2 = cos(2*x);
plot(x,y2)

legend('cos(x)','cos(2x)')

I got

The legend looks like this, which I can not understand.

If you check the last question I raised. All my figures have some problems with the legend. I do not know why. It seems that I need to change some settings of the matlab. The 2019b and 2020a both have this legend problem.

It looks like a very basic question. But it really annoys me for some time.

Any help, many thanks!

[KALYAN ACHARJYA]

I have used earlier one, no issue? Which version you are using?

Answer 1

[Star Strider]

This is a problem with certain AMD graphics drivers.

First, see if there is an update for the AMD driver. If so, let the AMD software update it for you.

In the interim, use:

opengl('software')

and if you want to save that for future sessions:

opengl('save','software')

However, it would be best to update the driver before you use the 'save' option. In the latest AMD driver versions, this is no longer a problem.

[qaqcvc]

Thanks！You saved my life

That's the problem of my AMD graphics driver

[Star Strider]

As always, my pleasure!

The newest driver versions do not have that problem (or any problems that I have been able to discover).

[KALYAN ACHARJYA]

Great Sir +1

[Star Strider]

Kalyan — Thank you!

Answer 2

[the cyclist]

There is a box around the legend by default, and I cannot remember that ever not being the case.

Does this happen from a freshly started instance of MATLAB, having run no other code first?

Immediately after starting MATLAB, I would try each of the following, to see if any of them mention the legend:

• get(0)
• get(gcf)
• type startup.m