Giisiaiknnaii, Nesting user-defined functions – HP 48g Graphing Calculator User Manual
Page 140
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To
execute a user-defined function:
11
■ To use the stack, put the arguments on the stack in the same order
they appear in the left side of the function definition (the last
argument should be in stack level 1), then press the function key in
the VAR menu (or type the function name and press (ENTER)).
B To use algebraic syntax, press
CD,
press the function key in the
VAR menu (or type the function name), press cao> enter the
algebraic arguments in their proper order and separated by commas,
then press (ENTER) (or press (EVAl) to evaluate the expression).
Example:
Execute the user-defined function CMB from the earlier
example to make the following calculations.
Step 1:
Calculate the total number of ways to combine one or more
of four items (n = 4).
4 C M B
1:
15
Step 2:
For the same value of n, calculate the combinations in
algebraic syntax.
O
C M B
(3(11)4
fEVAn
1:
giisiaiKnnaii
15
15
Step 3:
Calculate CMB(Z) in algebraic syntax, where T is a formal
variable. (Purge Z to make sure is doesn't contain an
object.)
CD© z 3(PUM3
CD c M B (3 SD © z
(EVAL)
1:
'Z'^Z-r
Nesting User-Defined Functions
Just like built-in functions, user-defined functions can be included in
the defining expression of a user-defined function.
11-8 Using l\flathematical Functions