Why do I see the error "Caught unexpected fl::except​::IInterna​lException​" when using the "plot" function?

When I have a plot function in my code it does not plot. Instead it gives this error:

ERROR : Caught unexpected fl::except::IInternalException

What does this mean and how is it fixed?

Answer 1

[MathWorks Support Team]

This error might appear if you have another function named "plot" on your path. Execute the following line to identify all functions named "plot" on your path.

>> which -all plot

If there is a user-defined function listed above the built-in, it may need to be renamed or removed from your path.

Note that you may see a number of other plot functions that are located in the MATLAB install directory. This is expected. They implement specific functionality for other built-in classes.

[Walter Roberson]

There was a run of people for which it was due to namespace issues/ The driver version of it only seems to have cropped up with some ubuntu.

Answer 2

[Avra Mitra]

Well, for me, it happened due to the graphics driver issue. The OS is ubuntu 16.04 LTS. To solve this problem, type:

opengl info

There, Matlab will give you low-level graphics troubleshooting methods.

The method of starting Matlab with software OpenGL solved my problem:

rik@ideapad:~$ matlab -softwareopengl