Directories - HP -28S Manual

You used the following commands to create, recall, and purge vari-
ables. These commands treat all variables alike, regardless of their
contents.
Command Description
STO Creates a variable with the specified value and name.
RCL Recalls the contents of the specified variable.
PURGE Deletes one or more specified variables.
Directories
In chapter 4, uRepeating a Calculation,u you used the Solver to calcu-
late the total resistance of two series-parallel circuits, with two sets of
resistor values that could be applied to either circuit. Here is a review
of the concepts you learned.
There are two primary motivations for creating directories .
• To
group together
the variables for a particular application or topic.
You created the directory EE for your electrical engineering prob-
lems so that, when you're working on these problems, you can
focus on the relevant variables. Equally important, when you're
working on other problems, the electrical engineering variables are
all hidden within the EE directory.
• To
keep separate
sets of variables that use the same names. You cre-
ated directories SP! and SP2
(series-parallel-l
and
series-parallel-2)
within EE to hold different values of the variables Rl, R2, and R3.
You can switch from one set of values to the other simply by
switching directories.
Creating a Directory. To create a directory you enter a name and
execute CRDIR
(create directory).
The name of the directory appears in
the USER menu. The new directory is called a
subdirectory,
and the
directory that contains it is called its
parent directory.
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