HP 49g Graphing Calculator - Manual (Page 149)

To evaluate a user-defined fimction:
1. Go to the directory where you stored the function, and press
The variables in the directory are displayed on the function-key menu.
2. Press the fimction key that corresponds to the variable.
The fimction name is displayed on the command line.
3. With the cursor after the function name, press 0® to insert
parentheses.
4. Enter the argument or arguments between the parentheses.
If the fimction takes more than one argument, separate each argument
with a comma.
5. To evaluate the fimction:
• press (ENTER) to obtain an exact answer, or
® press 0 ¡3® to obtain an approximate answer.
Evaluating a user-defined Function
Directories
You can create directories on the HP 49G just as you create directories on
a computer. A directory is simply a named area of memory in which you
can store variables (and other directories).
For example, you might create a niunber of variables relating to
mechanical engineering calculations. You would probably find these
variables more easily if they were stored together. Therefore, you could
create a directory and store just your mechanical engineering variables in
that directory. Then, when you need one of the these variables, you go to
that directory and select the variable.
Wlien you turn on the HP 49G for the very first time, you will find just one
directory. This is called HOME. Unless you specify otherwise, all the
variables you create will be stored in HOME. If you intend to create
numerous variables, you may find it easier if you create a directoiy for
each set of similar variables you create: one directory for your mechanical
engineering variables, another for chemistry variables, and so on.
Storing objects Page 7-5