Texas Instruments TITANIUM TI-89 - Manual (Page 478)

Additional Graphing Topics 478
For example, consider the previous three-piece function.
Note: For information about similarities and differences between functions and
programs, refer to Programming.
A multi-statement, user-defined function can have many of the control and decision-
making structures (
If , ElseIf , Return , etc.) used in programming. When creating the
structure of a function, it may be helpful to visualize it first in a block form.
Ê
Func and EndFunc must begin and end the function.
When entering a multi-statement function on the Y= Editor or Home screen, you must
enter the entire function on a single line.
When: Use expression:
x < Mp 4 sin(x)
x | M p and x < 0 2x + 6
x | 0
6 – x
2
К
К
Func
If x<
M p
Then
Return 4
ù
sin(x)
ElseIf x>=
-p
and x<0 Then
Return 2x+6
Else
Return 6–x^2
EndIf
EndFunc