Texas Instruments TI-89 Voyage 200, User Manual

Page: 107 / 1008

Previews 107
4. Display the
Window Editor
, and set the
Window variables as shown to the right.
Press
8 $
0
D
10
D
.1
D
0
D
?
10
D
110
D
10
D ?
10
D
120
D
10
D
0
D
.001
D
20
5. Display the Graph screen.
Because you did not specify an initial
condition, only the slope field is drawn (as
specified by
Fields=SLPFLD
in the
GRAPH
FORMATS
dialog box).
Press
8 %
6. Return to the
Y= Editor
and enter an initial
condition:
yi1=10
Press
8 # ¸
10
¸
7. Return to the Graph screen.
Initial conditions entered in the
Y= Editor
always occur at t
0
. The graph begins at
the initial condition and plots to the right.
Then it plots to the left.
Press
8 %
Steps and keystrokes Display
The initial condition is
marked with a circle.