Define persistent variable
Syntax
persistent X Y Z
Description
persistent X Y Z
defines X, Y, and Z as persistent in scope, so that X, Y, and Z maintain their values from one call to the next. persistent can be used within a function only.
Persistent variables are cleared when the M-file is cleared from memory or when the M-file is changed. To keep an M-file in memory until MATLAB quits, use mlock. If the persistent variable does not exist the first time you issue the persistent statement, it is initializied to the empty matrix.
It is an error to declare a variable persistent if a variable with the same name exists in the current workspace.
By convention, persistent variable names are often long with all capital letters (not required).
See Also
clear, global, mislocked, mlock, munlock
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