Texas Instruments TINSPIRE Teacher Software Guidebook - Page 447

Locking and unlocking variables Locking lets you protect variables from modification or deletion. Locking prevents unintended changes to a variable. Time and altitude lists can be locked to ensure problem fidelity Reference function f1 can be locked to prevent unintended change 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 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. For details about Lock, UnLock, and getLockInfo(), refer to the Reference Guide section of the documentation. Using Variables 435