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variable p1. Press I @PURGE@ J@@p1@@ `. The screen will now show
variable p1 removed:
You can use the PURGE command to erase more than one variable by placing
their names in a list in the argument of PURGE. For example, if now we wanted
to purge variables R and Q, simultaneously, we can try the following exercise.
Press :
I @PURGE@ „ä³ J@@@R!@@ ™ ‚í ³ J@@@Q!@@
At this point, the screen will show the following command ready to be executed:
To finish deleting the variables, press `. The screen will now show the
remaining variables:
Using function PURGE in the stack in RPN mode
We start again at subdirectory {HOME MANS INTRO} containing 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.
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