Texas Instruments TI-89 Manual Book page 205

Note: To display different
graphs in both parts of a
split screen, you must use
the 2-graph mode.
Important: Because
Fields= cannot plot a
DIRFLD
time axis, you must change
the Fields setting.
FLDOFF
turns off all fields.
Note: When you enter 2-
graph mode, Window
variables for the right side
are set to their defaults.
188 Chapter 11: Differential Equation Graphing
To examine this harmonic oscillator in more detail, use a split screen
to graph the manner in which
9. Press 3 and change the
mode settings on Page 2 as
shown. Then close the
dialog box, which redraws the
graph.
10. Press 2 a to switch to the
right side of the split screen.
11. Use † to select
y1'
The right side uses the same
equations as the left side.
However, no equations are
selected initially in the right
side.
12. Press:
ƒ
9
— or —
¥ Í
TI-89:
¥
TI-92 Plus: F
Set =
Fields FLDOFF
13. In the Y= Editor, press:
: 2 ‰
TI-89
TI-92 Plus: ‰
and make sure
Axes = TIME
14. In the Window Editor, change
and as shown to the
ymin ymax
right.
15. Press ¥ % to display the
Graph screen for graph #2.
The left side shows the phase-
plane orbit. The right side
shows the solution curve and
its derivative.
16. To return to a full screen of
the original graph, press
2 a to switch to the left
side. Then press 3 and
change the
Split Screen
and change with respect to time
y y'
MODE
and y2' .
.
.
ymin=ë 2.
ymax=2.
Split Screen = FULL
setting.
.
(t)
y' y