Hp 33s User Manual download pdf (Page 96)

6–4 Entering and Evaluating Equations

Entering Equations into the Equation List

The equation list is a collection of equations you enter. The list is saved in the

calculator's memory. Each equation you enter is automatically saved in the

equation list.

To enter an equation:

Make sure the calculator is in its normal operating mode, usually with a

number in the display. For example, you can't be viewing the catalog of

variables or programs.

2. Press

. The EQN annunciator shows that Equation mode is active,

and an entry from the equation list is displayed.

3. Start typing the equation. The previous display is replaced by the equation

you're entering — the previous equation isn't affected. If you make a mistake,

press

as required. You can enter up to 255 characters per equation.

4. Press



to terminate the equation and see it in the display. The equation

is automatically saved in the equation list — right after the entry that was

displayed when you started typing. (If you press



instead, the equation is

saved, but Equation mode is turned off.)

Equations can contain variables, numbers, functions, and parentheses — they're

described in the following topics. The example that follows illustrates these

elements.

Variables in Equations

You can use any of the calculator's 28 variables in an equation: A through Z, i,

and

(i). You can use each variable as many times as you want. (For information

about

(i), see "Indirectly Addressing Variables and Labels" in chapter 13.)

To enter a variable in an equation, press

variable (or

variable). When

you press

, the A..Z annunciator shows that you can press a variable key to

enter its name in the equation.

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Hp 33s User Manual Page 96