Locking and Unlocking Variables
Locking a variable protects it from modification or deletion, and prevents unintended changes to a defined variable. For example, you may want to lock variables that define time or altitude to ensure integrity.
You cannot lock the following variables:
| • | System variable ans |
| • | stat. and tvm. variable groups |
| 1. | Go to the Calculator application, and tap the entry line to show the keyboard. |
| 2. | Tap Tools  . |
| 3. | Go to Actions, and then tap Lock. |
| 4. | Tap Lock Variable to select the function and insert it into the entry line. |
| 5. | Tap  , and then tap the variable name you want to lock. |
Note: You can also type the variable name in the entry line.
| 6. | Tap ENTER. |
The result Done indicates the variable is locked.
Locked variables display a lock icon on the variable menu list.
Note: The Lock command clears the Redo/Undo history when applied to unlocked variables.
To modify or delete a locked variable, you must unlock the variable.
| 1. | Tap Tools and go to Actions > Lock. |
| 2. | Tap Unlock Variable to enter the function into the entry line. |
| 3. | Tap , and then tap the locked variable name. |
| 4. | Press ENTER to remove the locked status. |
The result Done indicates the variable is now unlocked.