Using function PURGE in the stack in RPN mode
Assuming that our variable list contains the variables p1, z1, Q, R, and α. We will use command PURGE to delete variable p1. Press ³@@p1@@ ` I @PURGE@. The screen will now show variable p1 removed:
To delete two variables simultaneously, say variables R and Q, first create a list (in RPN mode, the elements of the list need not be separated by commas as in Algebraic mode):
J „ä³ @@@R!@@ ™³ @@@Q!@@ `
Then, press I@PURGE@ use to purge the variables.
Additional information on variable manipulation is available in Chapter 2 of the calculator’s user’s guide.
UNDO and CMD functions
Functions UNDO and CMD are useful for recovering recent commands, or to revert an operation if a mistake was made. These functions are associated with the HIST key: UNDO results from the keystroke sequence ‚¯, while CMD results from the keystroke sequence „®.
CHOOSE boxes vs. Soft MENU
In some of the exercises presented in this chapter we have seen menu lists of commands displayed in the screen. This menu lists are referred to as CHOOSE boxes. Herein we indicate the way to change from CHOOSE boxes to Soft MENUs, and vice versa, through an exercise.
Although not applied to a specific example, the present exercise shows the two options for menus in the calculator (CHOOSE boxes and soft MENUs). In
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