HP 39g+ - Manual (Page 43)

Aplets and their views 2-3
Evaluating expressions
In aplets In the Symbolic view, a variable is a symbol only, and does
not represent one specific value. To evaluate a function in
Symbolic view, press
@W6G• . If a function calls another
function, then @W6G• resolves all references to other functions
in terms of their independent variable.
1. Choose the Function
aplet.
>$3/(7@
Select
Function
TU6SU•
2. Enter the expressions in
the Function aplet’s Symbolic view.
>$/3+$@A >;@
•Y••
>[@
••PF••
>$/3+$@B
••PF•••
>$/3+$@F1 >@
•Y••
>@>@
>$/3+$@F2 >@
•Y••Ã
>@
••PF•••
3. Highlight F3(X).
*k,
4. Press @W6G•
Note how the values for
F1(X) and F2(X) are
substituted into F3(X).
In HOME You can also evaluate any expression in HOME by entering it
into the edit line and pressing
>(17(5@.
For example, define F4 as below. In HOME, type F4(9) and
press >(17(5@. This evaluates the expression, substituting
9 in
place of X into F4 .