.
To graph a piecewise-defined function,
each piece of the function along with the x-interval for which
the piece is defined must be entered into the equation editor,
which is accessed by pressing
.
For example, observe the procedure for entering the 3-piece function below.
The following nested when statement is needed to plot the piecewise-defined
function. when may be typed in or accessed by pressing
.
The inner when statement graphs 
when 
and
otherwise. The
outer when statement graphs the first graph for 
and 
otherwise.
Once the when statement is entered, Press 
.
Notice that the function is displayed in "pretty print". This feature puts the function in a form that makes it easier to check that the function has been entered correctly.
To prevent the different pieces from being connected as the function is being
graphed, check that the function is highlighted,
then press 
and select DOT.
Adjust the viewing window (if necessary) and press
to see the graph.
