Variables and memory management, Introduction, Introduction -1 – HP 39g Graphing Calculator User Manual

Page 165

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Variables and memory management

Introduction

The HP 39G/40G has approximately 232K of user memory.
The calculator uses this memory to store variables, perform

computation, and store history.

A variable is an object that you create in memory to hold data.
The HP 39G/40G has two types of variables, home variables

and aplet variables.

•

Home variables are available in all aplets. For example,
you can store real numbers in variables A to Z and

complex numbers in variables ZO to Z9. These can be
numbers you have entered, or the results of calculations.
These variables are available within all aplets and within

any programs.

•

Aplet variables apply only to a single aplet. Aplets have

specific variables allocated to them which vary from

aplet to aplet.

You use the calculator’s memory to store the following
objects:

copies of aplets with specific configurations

new aplets that you download

aplet variables

home variables

variables created through a catalog or editor, for example
a matrix or a text note

programs that you create.

You can use the Memory Manager (|

shift

|M£MO/;y)

to view

the amount of memory available. The catalog views, which

are accessible via the Memory Manager, can be used to
transfer variables such as lists or matrices between

calculators.

Variables and memory management

11-1