Function Graphing 4-9
The Window variables determine the boundaries and other attributes of the
viewing window. The Window variables are shared by all graphing modes.
The viewing window of the TI-80 is the portion of the
coordinate plane defined by XMIN, XMAX, YMIN, and YMAX.
The distance between tick marks is defined by XSCL for the X
axis and YSCL for the Y axis.
XMAX
YMIN
YMAX
XSCL
YSCL
XMIN
Press ) to display the current Window variable values.
The values shown here are the default values.
To change a Window variable value:
1. Press 8 to move to the Window variable you want to
change.
2. To enter a real value (which can be an expression), you
may do any of the following:
¦Position the cursor, and then make the changes.
¦Press M to clear the value, and then enter a new
value.
¦Begin entering a new value. The original value is cleared
automatically when you begin typing.
3. Press ¸, 8, or 7. If you entered an expression, it is
evaluated. The new value is stored.
XMIN must be less than XMAX, and YMIN must be less than
YMAX, or you will get an error message when you press
,. To turn off the tick marks, set XSCL=0 and YSCL=0.
Defining the Viewing Window
The Viewing
Window
Checking the
Viewing Window
Changing a
Window Variable
Value