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Is it possible to load a variable that can not be cleared

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John
John on 12 Jul 2019
Answered: Walter Roberson on 13 Jul 2019
I have a variable 'x' that is loaded using the startup file in ...\Documents\MATLAB\startup.m that executes the command
load x
I want this variable to remain in the workspace after executing
clear
in any of my MATLAB scripts or functions. Is this possible?

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Walter Roberson
Walter Roberson on 12 Jul 2019
Which workspace does it need to stay in? Do any of the scripts need to execute at the command prompt, or are they all called within functions? Does the variable need to survive "clear all"?

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Answers (2)


Walter Roberson
Walter Roberson on 13 Jul 2019
Create a function named X.m that when given the argument 'load' loads the value of X from a file and puts it into a persistent variable and uses mlock
https://www.mathworks.com/help/matlab/ref/mlock.html
For any other argument, including no argument, index the persistent variable and return that result.
Limitations:
  1. does not permit the user to store into the variable
  2. does not permit use of end as an index
You can possibly improve on this by defining an object with subsref and subsasgn behavior.
You cannot simply mlock a variable however.

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