Entering and evaluating equations, How you can use equations – HP 33s User Manual
Page 93
Entering and Evaluating Equations
6–1
6
Entering and Evaluating Equations
How You Can Use Equations
You can use equations on the HP 33s in several ways:
For specifying an equation to evaluate (this chapter).
For specifying an equation to solve for unknown values (chapter 7).
For specifying a function to integrate (chapter 8).
Example:
Calculating with an Equation.
Suppose you frequently need to determine the volume of a straight section of pipe.
The equation is
V = .25
π
d
2
l
where d is the inside diameter of the pipe, and l is its length.
You could key in the calculation over and over; for example, .25
|
N z
2.5
! z
16
z
calculates the volume of 16 inches of 2
1
/
2
–inch
diameter pipe (78.5398 cubic inches). However, by storing the equation, you get
the HP 33s to "remember" the relationship between diameter, length, and
volume — so you can use it many times.
Put the calculator in Equation mode and type in the equation using the following
keystrokes:
Keys:
Display:
Description:
| H
!!
or the current equation
Selects Equation mode, shown
by the EQN annunciator.