Texas Instruments TITANIUM TI-89 User Manual

Page 420

Differential Equation Graphing

420

Note:

During a trace, you can move the cursor to a particular point by typing a value for t

and pressing

¸. You can use QuickCenter at any time during a trace, even if the

cursor is still on the screen.

„

Zoom

Works just as it does for function graphs.

•

Only

(

xmin

xmax

xscl

) and

(

ymin

ymax

yscl

)

Window variables are affected.

•

The

Window variables (

tmax

tstep

tplot

) are not

affected unless you select

6:ZoomStd

(which sets all

Window variables to their standard values).

…

Trace

Lets you move the cursor along the curve one tstep at a
time. To move approximately ten plotted points at a time,
press

2 B

2 A

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

to center the viewing window on the cursor location.

Use

to view results on all plotted curves.

‡

Math

Only 1:Value is available.

•

With TIME axes, the

y(t)

solution value (represented by

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.

Tool

For Differential Equation Graphs: