clear function does not work

Hi: After my code finished, I see that the Matlab occupied about 20GB memory. I tried to clear them but failed.

I have tried clear, clear all, clearvars, clearvars -global, etc. which can be find here: https://www.mathworks.com/help/matlab/ref/clear.html is there anyway to figure out why this happens?

Thanks! Yu

[per isakson]

How exactly do you "see that the Matlab occupied about 20GB memory"?

Please, see the Help on formatting a question.

[Yu Li]

In task manager.

Answer 1

[Stephen23]

https://www.mathworks.com/matlabcentral/answers/316681-matlab-doesn-t-release-memory-when-variables-are-cleared