Special Graphs on the TI-89: Greatest Integer

IV. Special Graphs

B. Greatest Integer

The greatest integer function (also called a step function) is actually a piecewise defined function with a special definition. The function has the notation or when it is written, but the TI-89 designates this function by . It can be accessed in the catalog, or you can type it in using alpha. The value of the function is the greatest integer less than or equal to x. So, f(1)=1 and f(1.4)=1. Since this is a piecewise function you should use the Dot mode.

Press to
access Y=Editor. Then
press
and scroll to int(.

Press ENTER and
complete entering
the function.

Select the function, then
press and
select 2:Dot mode.

Now press to
select the Zoom Decimal
window.

Press ENTER to draw
the graph.

III. Working
with Graphs

IV. Special
Graphs

V. Other
Graph Modes

Press to access Y=Editor. Then press and scroll to int(.
Press ENTER and complete entering the function.
Select the function, then press and select 2:Dot mode.
Now press to select the Zoom Decimal window.
Press ENTER to draw the graph.