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Variables and memory management 17-1
17
Variables and memory management
Introduction
The HP 40gs has approximately 200K of user memory.
The calculator uses this memory to store variables,
perform computations, and store history.
A variable is an object that you create in memory to hold
data. The HP 40gs 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 Z0 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 (
MEMORY) 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.
hp40g+.book Page 1 Friday, December 9, 2005 1:03 AM