IV. Special Graphs

E. Piecewise

The TI-89 will graph a piecewise defined function. To do this, you will use the syntax when(condition,trueExpression, falseExpression).The when( option is available via the catalog.

Example: Graph the function: .

Press and
select the y1 function.
Go to the catalog and
select the when(
option.
Type the function.
The < is accessed by
pressing .
Put the function in
dot mode by pressing
which is
the Style menu.
Select 2:Dot and ENTER.
Select and then
select 4:ZoomDec.
Press ENTER and
the graph is displayed.

To graph a three piece function, use nested when functions.

Example: Graph

The function is entered as

Enter the function.
Graph with ZoomStd.

 

Derivatives
Greatest Integer
Integral
Inverse
Piecewise
I. Entering
Graphs
II. Windows
& Styles
III. Working
with Graphs
IV. Special
Graphs
V. Other
Graph Modes