How to clear workspace from a function?
17 views (last 30 days)
Show older comments
Louis Tomczyk on 16 Jan 2023
I want to create a function that will perform some maintenance operations at the beginning of the script. For example, this function takes a few arguments that will lead to specific initialisations of paths and variables, and above all, clear the workspace from the previous run.
I want to put it in a specific function as the job requires dozens of lines which are quite irrelevant in the work. And I want my "main' script to be as short, readible and high-level as possible.
Below only the first lines of the function.
clearvars -except varargin
However if I do 2 consecutive runs, it does not clear the workspace. If I want to, I need to explicitely write the "clear" command in the main script, which I try to avoid.
Is there any way to do it?
Thanks in advance.
Bora Eryilmaz on 16 Jan 2023
Edited: Bora Eryilmaz on 16 Jan 2023
Functions do not keep their variables across calls to them unless a variable is specifically defined in the function using the "persistent" keyword. So, you do not need to try to clear variables in a function workspace in this scenario. Each call to the function has its own variable scope (i.e., workspace), which is already clear when the function starts executing, except of course for the variables that you pass to the function as input arguments.
If the function accesses the variables in the base workspace (using evalin, etc.), that is a different question, in which case you can use the clear command.
More Answers (2)
Hiro Yoshino on 16 Jan 2023
You should understand Base and Function Workspaces. Note that they are different.
One way you can delete variables from the Function Workspace is that you make your variables "global" so you can have access from anywhere.
Find more on Whos in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!Start Hunting!