Using Variables 435
Locking and unlocking variables
Locking lets you protect variables from modification or deletion. Locking
prevents unintended changes to a variable.
Variables you cannot lock
• System variable Ans
• stat. and tvm. variable groups
Important information about locked variables
• To lock variables, use the Lock command.
• To modify or delete a locked variable, you must first unlock the item.
• Locked variables display a lock icon on the variable menu list.
• The Lock command clears the Redo/Undo history when applied to
unlocked variables.
Examples of locking
For details about Lock, UnLock, and getLockInfo(), refer to the
Reference Guide section of the documentation.
Time and altitude lists can be
locked to ensure problem fidelity
Reference function
f1 can be
locked to prevent unintended
change
Lock a,b,c Locks variables a, b, and c from the Calculator
application.
Lock mystats. Locks all members of variable group mystats.
UnLock func2 Unlocks variable func2.
lm:=getLockInfo(var2) Retrieves the current lock status of var2 and
assigns that value to lm in the Calculator
application.
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