Hp 49g Graphing Calculator Manual do Utilizador descarregar pdf (Página 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

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Hp 49g Graphing Calculator Manual do Utilizador Página 146