The HP 32sii can be used for specifying an equation to evaluate.
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HP 32sii Calculator  Entering and Evaluating Equations
Calculator symbol key
The procedures in this document use the following text to represent symbol keys:
Key

Description

Text Representation


Right shift key

RS


Leftshift key

LS


Accumulates statistical data

SUM+


pi

pi

Calculating with an equation
Suppose there is a frequent need to determine the volume of a straight pipe. The equation is
V = .25 pi d^{2} l
Where d is the inside diameter of the pipe, and l is its length.
The calculation could be keyed in over and over. For example:
.25, ENTER, RS, pi, x, 2.5, LS, x^{2}, x, 16, x calculates the volume of 16 inches of a 2 1/2inch diameter pipe (78.5398 cubic inches). However, by storing the equation, the HP 32sii can "remember" the relationship between diameter, length, and volumeso it can be used many times.
Put the calculator in equation mode and type in the equation using the following keystrokes:
Keys

Display

Description

Press RS, then EQN

EQN LIST TOP or the current equation

Selects Equation mode, shown by the EQN annunciator.

Press RCL

"_"

Begins a new equation, turning on the equationentry cursor. RCL turns in the A...Z annunciator so a variable name can be entered.

Press V, RS, then [=]

V = "_"

RCL, V types V and moves the cursor to the right.

Press [.] 2, then 5

V = 0.25_

Digit entry uses the "_" digitentry cursor

Press x, RS, pi, then x

V = 0.25 x pi x "_"

x ends the number and restores the "_"

Press RCL, D, y<superscript>x</superscript>, then 2

= 0.25 x pi x D ^ 2 "_"

y^{x} types ^.

Press x, RCL, then L

0.25 x pi x D^2 x L "_"

V = scrolls off the left side of the display

Press ENTER

v = 0.25xpixD^2x

Terminates and displays the equation. The right arrow shows that part of the equation does not fit in the display, and the symbol above SUM+ means press SUM+ to see characters in that direction.

Hold RS and SHOW

CK = 5836 026.0

Shows the checksum and length for that equation, so keystrokes can be checked.

By comparing the checksum and length of the equation with those in the example, it can be verified that the equation has been entered properly.
Evaluate the equation (to calculate V):
Keys

Display

Description

Press ENTER

D? value

Prompts for variables on the righthand side of the equation. Prompts for D first; value is the current value of D

Press 2, [.]. 1, [.]. then 2

D? 2 1/2_

Enters 2 1/2 inches as a fraction

Press R/S

L? value

Stores D, prompts for L; value is current value of L

Press 16, then R/S

v = 78.5398

Stores L; calculates V in cubic inches and stores the result in V

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