Plot not shown in figure

I've recently updated MATLAB R2021b from the prerelease version (9.11.0.1687835) to a regular one (9.11.0.1769968). I'm running a computer with an up to date CentOS 8. When I try to plot anything (e.g.:

plot(1:10)

), an empty figure window is opened but no plot is shown. This did not happen in the prerelease version. How can I fix it?

On startup the following error message is shown:

com.jogamp.opengl.GLException: X11GLXDrawableFactory - Could not initialize shared resources for X11GraphicsDevice[type .x11, connection :0, unitID 0, handle 0x0, owner false, ResourceToolkitLock[obj 0x4544629, isOwner false, <67e097d5, 555ddc5d>[count 0, qsz 0, owner <NULL>]]]
	at jogamp.opengl.x11.glx.X11GLXDrawableFactory$SharedResourceImplementation.createSharedResource(X11GLXDrawableFactory.java:326)
	at jogamp.opengl.SharedResourceRunner.run(SharedResourceRunner.java:297)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
	at jogamp.opengl.GLContextImpl.makeCurrent(GLContextImpl.java:688)
	at jogamp.opengl.GLContextImpl.makeCurrent(GLContextImpl.java:580)
	at jogamp.opengl.x11.glx.X11GLXDrawableFactory$SharedResourceImplementation.createSharedResource(X11GLXDrawableFactory.java:297)
	... 2 more

I've read the Resolving Low-Level Graphics Issues article in the documentation but it doesn't help. The command

rendererinfo(gca)

gets stuck and doesn't output anything.

Answer 1

[prabhat kumar sharma]

Hi Gypaets,

I understand you're encountering an issue with graphics, and it seems like there's a system issue with OpenGL on CentOS. You can try the following workaround, where you launch MATLAB through a command in a Linux shell:

1.Execute the following command in a Linux shell to start MATLAB:

matlab -softwareopengl

This command instructs MATLAB to use only software OpenGL libraries.

2.Execute the following command in a Linux shell to start MATLAB:

matlab -noopengl

This command uses the undocumented '-noopengl' startup flag to ensure that MATLAB does not use any OpenGL libraries.

3,Create a file named 'java.opts' in the directory from which MATLAB is executed, containing the line:

-Djogl.disable.openglarbcontext=1

Then start MATLAB, and everything should work as expected.

If the above methods do not work, I suggest you contact MathWorks official support.

https://in.mathworks.com/support/contact_us.html

I hope it helps!