HP HP-18C User Manual

In most cases, this is all you will need to know about how the solver
works. However,
there are certain types of formulas that are more
difficult to solve. If , during the calculation, the history stack is over-
written by sets of changing numbers (see figure B-1 on page 174), you
should read the section , How the Solver Works starting on page 137.
Clearing User-Variables
Clearing user-variables sets them equal to 0 and clears the history
stack.
To clear a set of user-variables associated with a particular cus-
tom menu, display the custom menu and press .1 CLEAR ALL I.
User-variables are also cleared when the formula is edited.
Viewing Long Formulas
The formula list shows only the first 22 characters of a formula. To
view the entire current formula, press u. . The entire formula (up
to 68 characters) is displayed (see figures 9-5 and 9-6). If the formula
is longer than 68 characters, use [I] to see the rest of the formula .
When you are done viewing the formula, press II1II.
132 9: The Formula Solver

HP HP-18C Specifications

General

Brand	HP
Model	HP-18C
Category	PDA
Language	English