Texas Instruments TITANIUM TI-89 - Manual (Page 430)

Differential Equation Graphing 430
To examine this harmonic oscillator in more detail, use a split screen to graph the
manner in which y and y' change with respect to time (t).
9. Press 3 and change the mode
settings on Page 2 as shown. Then close
the MODE dialog box, which redraws the
graph.
Note: To display different graphs in both
parts of a split screen, you must use the
2
-graph mode.
10. Press 2 a to switch to the right side
of the split screen.
11. Use † to select
y1' and y2' .
The right side uses the same equations
as the left side. However, no equations
are selected initially in the right side.
12. Press:
,
9
— or —
@ 8 Í Set
Fields = FLDOFF .
Important: Because Fields=DIRFLD cannot
plot a time axis, you must change the
Fields setting.
FLDOFF turns off all fields.
13. In the Y= Editor, press:
@ 2 ‰and make sure
Axes = TIME .