Texas Instruments TI-89 Titanium User Manual page 409

Tool For Differential Equation Graphs:
„
Works just as it does for function graphs.
Zoom
•
•
...
Lets you move the cursor along the curve one tstep at a
Trace
time. To move approximately ten plotted points at a time,
press
If you enter initial conditions in the Y= Editor or let the
ncurves Window variable plot curves automatically, you
can trace the curves. If you use:
@
IC from the Graph screen to select initial conditions
interactively, you cannot trace the curves.
QuickCenter applies to all directions. If you move the
cursor off the screen (top or bottom, left or right), press
¸
Use
‡
Only 1:Value is available.
Math
•
•
During a trace, you can move the cursor to a particular point by typing a value for t
Note:
and pressing ¸. You can use QuickCenter at any time during a trace, even if the
cursor is still on the screen.
Differential Equation Graphing
x xmin xmax
Only ( ,
Window variables are affected.
t
The Window variables (
affected unless you select
Window variables to their standard values).
2 B 2 A
or .
2 Š
to center the viewing window on the cursor location.
C D
or to view results on all plotted curves.
With TIME axes, the
yc) is displayed for a specified t value.
With CUSTOM axes, the values that correspond to x and
y depend on the axes you choose.
xscl y ymin
, ) and ( ,
t0 tmax tstep
, , ,
6:ZoomStd
(which sets all
y(t)
solution value (represented by
ymax yscl
, )
tplot
) are not
406