Deleting The Current Formula And/Or Its User-Variables - HP -18C Owner's Manual

COST is a shared user-variable. You can calculate a value for COST
using the custom menu for CARPETPRICE, and then switch to the
custom menu for TOTALPRICE. Since the value for COST is shared,
you do not need to store it again. After entering HOURS, you can
calculate CHARGE.
No sharing occurs between built-in variables and user-variables. For
example, the COST user-variable in the formula solver is not shared
with the COST built-in variable in the
MU%C
and
MU%P
menus.
Deleting the Current Formula and/or Its
User-Variables
Each formula in the formula list uses calculator memory to store the
formula and the user-variables in the formula . For example, the
formula:
P P S
'l
}::L
}:: ~j.;-9
=
C
I]
S T
uses five storage locations. One location stores the formula; four loca-
tions store the user-variables PPSY, L, W, and COST. Deleting the
variables frees the storage locations used to store PPSY, L, W, and
COST. Deleting both the variables and the formula frees these four
locations, plus the location used to store the formula.
To delete the user-variables, or both the user-variables and the
formula:
1. Press
Ii1BiI
to display the
DELET
menu .
2. Do a or
b:
a.
Press " to delete the user-variables associated with the
current formula . The user-variables are created again the
next time you use the formula. If the user-variable is a
shared variable, its value is lost to all the formulas that
share it.
b. Press
ImIDI
to delete the current formula and its user-
variables.
9: The Formula Solver 135