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Suppose I run a script X.m and it creates a bunch of variables, and I want to save a variable called Z, so I write myVar = Z.
I then type clear at the prompt, and run Y.m.
Is there a way I can make it so that myVar does not disappear with all the other variables when I call clear?
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Workspace variables do not persist after you exit MATLAB. To use your data across multiple sessions, save it to a compressed file with a . mat extension called a MAT-file. You can restore saved data by loading a MAT-file back into MATLAB.
To clear all variables from the current workspace, use clear or clearvars . To clear all global variables, use clear global or clearvars –global . To clear a particular class, use clear myClass . To clear a particular function or script, use clear functionName .
clearvars -except keepVariables removes all variables, except for those specified by keepVariables . Use this syntax to keep specific variables and remove all others. clearvars variables -except keepVariables removes the variables specified by variables , and does not remove the variables specified by keepVariables .
You can use clearvars to clear all variables except specific ones from workspace. From clearvars documentation:
clearvars -except v1 v2 ... clears all variables except for those specified following the -except flag. Use the wildcard character '' in a variable name to exclude variables that match a pattern from being cleared. clearvars -except X clears all the variables in the current workspace, except for those that start with X, for instance. Use clearvars -except to keep the variables you want and remove all others.
So, you need to type
clearvars -except myVars
instead of clear.
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There's Keep on the MATLAB file exchange which lets you clear everything except certain variables that you wish to keep.
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