HP HP-28S User Manual

Using a Different Set of Values
Suppose you want to work on a different problem, with different val-
ues of Rl, R2, and R3, and later return to the values now assigned.
You could reenter all the values each time you switch problems, but
this section shows you an easier way. There are three steps:
1. Create a new directory for the new values.
2. Define the same expression to be EQ.
3. Use the Solver as before to assign values and evaluate the
expression.
This process
shows another benefit of directories: Within a directory,
only one variable can exist with a particular name; but any number of
directories can contain a variable with a particular name.
Step 1: Create a new directory.
Since
the new directory is an alternative to SPI, call it SP2 and create
it
within the same parent directory (namely EE). This will be the first
"branch"
within your directory structure-two subdirectories (SPI and
SP2) within the same parent directory (EE).
To create a subdirectory within EE, you must make EE the current
directory. (Any subdirectory you created now would be within SPI.)
Switch to the EE directory.
EE [ENTER 1
No Current Equation
2: 10
1: 12
IImIllmlm:mDilXl!llI!WimIiml
The calculator beeps, displays t·lo CWo r en t Equa t i cln, and acti-
vates
the SOLVE menu. This occurs because there is no current
equation 'EQ' in the EE directory.
Create a directory SP2.
~ SP2
.1 MEMORY 1 eRD I R
3: { HOME EE SP1 }
2: 10
1: 12
GImrm:::t!JtmDlIIIlIIcmmltDm
66 4: Repeating Calculations
I

HP HP-28S Specifications

General

Brand	HP
Model	HP-28S
Category	Calculator
Language	English