Texas Instruments PLUS TI-89 - Manual (Page 219)

202 Chapter 12: Additional Graphing Topics
12ADDLGR.DOC TI-89/TI-92 Plus: Additional Graphing Tools (English) Susan Gullord Revised: 02/23/01 1:03 PM Printed: 02/23/01 2:15 PM Page 202 of 20
Steps
³
TI-89
Keystrokes
›
TI-92 Plus
Keystrokes Display
1. Display the MODE dialog box.
For Graph mode, select
FUNCTION .
For Angle mode, select RADIAN .
3
B 1
D D D
B 1
¸ 3
B 1
D D D
B 1
¸
2. Display the Home screen. Use
the Graph command and the
when function to specify the
piecewise defined function.
† 2 selects Graph from the Other
toolbar menu and automatically adds
a space.
"
† 2 2 ™
W H E N j c X
2 Â 0 b · X
b 5 p 2 X
X d d ¥ "
† 2
W H E N c X
2 Â 0 b · X
b 5 p X
X d d
Graph when(x<0,ëx,5ùcos(x))
3. Execute the Graph command,
which automatically displays the
Graph screen.
The graph uses the current Window
variables, which are assumed to be
their standard values (
„ 6) for this
example.
¸ ¸
4. Draw a horizontal line across
the top of the cosine curve.
The calculator remains in “line” mode
until you select a different operation
or press
N .
2 ‰ 5
C (until the line
is positioned)
¸ ‰ 5
C (until the line
is positioned)
¸
5. Save a picture of the graph. Use
PIC1 as the variable name for the
picture.
Be sure to set Type = Picture. By
default, it is set to GDB.
ƒ 2
B 2 D D
P I C j 1
¸ ¸ ƒ 2
B 2 D D
P I C 1
¸ ¸
6. Clear the drawn horizontal line.
You can also press † to regraph.
2 ˆ 1 ˆ 1
7. Open the saved picture variable
to redisplay the graph with the
line.
Be sure to set Type = Picture. By
default, it is set to GDB.
ƒ 1
B 2
(if not already
shown, also set
Variable = pic1 )
¸
ƒ 1
B 2
(if not already
shown, also set
Variable = pic1 )
¸
Preview of Additional Graphing Topics
From the Home screen, graph the piecewise defined function: y = ì x when x < 0 and
y = 5 cos(x) when x ‚ 0. Draw a horizontal line across the top of the cosine curve. Then
save a picture of the displayed graph.