Defining The Viewing Window - Texas Instruments TI-89 Manual Book

Defining the Viewing Window

Displaying Window
Variables in the
Window Editor
Tip: To turn off tick marks,
set xscl=0 and/or yscl=0.
Tip: Small values of xres
improve the graph's
resolution but may reduce
the graphing speed.
Changing the
Values
Note: If you type an
expression, it is evaluated
when you move the cursor
to a different Window
variable or leave the
Window Editor.
From the Home
Screen or a Program
The viewing window represents the portion of the coordinate
plane displayed on the Graph screen. By setting Window
variables, you can define the viewing window's boundaries
and other attributes. Function graphs, parametric graphs, etc.,
have their own independent set of Window variables.
Press ¥ $ or O
Window Variables
(shown in Window Editor)
Variable Description
, , Boundaries of the viewing window.
xmin xmax
ymin , ymax
, Distance between tick marks on the x and y axes.
xscl yscl
Sets pixel resolution (1 through 10) for function graphs.
xres
The default is 2.
¦
At 1, functions are evaluated and graphed at each
pixel along the x axis.
¦
At 10, functions are evaluated and graphed at every
10th pixel along the x axis.
From the Window Editor:
1. Move the cursor to highlight the value you want to change.
2. Do any of the following:
¦
Type a value or an expression. The old value is erased when
you begin typing.
— or —
¦
Press M to clear the old value; then type the new one.
— or —
¦
Press A or B to remove the highlighting; then edit the value.
Values are stored as you type them; you do not need to press ¸.
¸ simply moves the cursor to the next Window variable.
You can also store values directly to the Window variables from the
Home screen or a program. Refer to "Storing and Recalling Variable
Values" in Chapter 2.
to display the Window Editor.
3
xmin
ymin
Corresponding Viewing Window
(shown on Graph screen)
Chapter 6: Basic Function Graphing
ymax
xscl
xmax
yscl
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