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82 An introduction to HP apps
Add a definition
With the exception of the Parametric app, there are 10 fields for
entering definitions. In the Parametric app there are 20 fields, two
for each paired definition.
1. Highlight an empty field you want to use, either by tapping
on it or scrolling to it.
2. Enter your definition.
If you need help, see “Definitional building blocks” on
page 82.
3. Tap or press
E when you have finished.
Your new definition is added to the list of definitions.
Note that variables used in definitions must be in uppercase.
A variable entered in lowercase will cause an error message
to appear.
Modify a definition
1. Highlight the definition you want to modify, either by tapping
on it or scrolling to it.
2. Tap .
The definition is copied to the entry line.
3. Modify the definition.
4. Tap or press
E when you have finished.
Definitional building blocks
The components that make up a symbolic definition can come
from a number of sources.
• From the keyboard
You can enter components directly from the keyboard. To
enter 2X
2
– 3, just press 2AXjw3.
• From user variables
If, for example, you have created a variable called COST,
you could incorporate that into a definition either by typing
it or choosing it from the User menu (one of the sub-menus
of the Variables menu). Thus you could have a definition that
reads F1(X)=X
2
+COST.
To select a user variable, press a, tap , select
User Variables, and then select the variable of interest.