Preview of additional graphing topics – Texas Instruments PLUS TI-89 User 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.