HP 49g Graphing Calculator - Manual (Page 146)

Variables
Variables enable you to store and retrieve objects. You do this by giving an
object a name. For example, if you regularly use a particular number in
calculations—say, 9.81 m/s^, the acceleration of gravity—you can create a
variable that associates this number with a name.
Variable names can be up to 127 characters long and can contain letters,
digits, and most other characters. You could, for example, call 9.81 m/s- G,
Gl, or GRAY. Then when you need to use 9.81 m/srin a calculation, you
can enter the variable name, or select it from a menu.
Some characters cannot be included in a variable name. These are:
® characters that separate objects: space, period, comma, @
® object delimiters: # [ ] “ ‘ f ) ( ) : _ « »
® mathematical symbols; for example, + -*/ ^ + <> = < > ^ d I
Also, you cannot use a command name or a menu name as the name of a
variable.
You can store any type of object in a variable: numbers, character strings,
equations, programs, graphics, and so on.
Creating a variable
1. Enter the data that you want to associate with a variable.
2. Press (§To>) to select the
STORE
command.
3. Enter a name for the variable. (See chapter 2, “Basic operation”, for
information on how to enter alphabetic characters.)
4. Press (MEB) to create the variable.
For example, to create a variable named GRAY to store the value 9.81,
enter the following on the command line:
9.81 (Sro») GRAY
See “Creating a directory” on page 7-6 for details of another method of
creating variables.
Page 7-2 Storing objects