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Chapter 10: Differential Equation Graphing

145

10DIFFEQ.DOC TI-86, Chap 10, US English Bob Fedorisko Revised: 02/13/01 2:28 PM Printed: 02/13/01 3:02 PM Page 145 of 20

Moving the Trace Cursor to a t Value

To move the trace cursor to any valid

value on the current equation, enter the number.

When you enter the first digit, a

prompt is displayed in the bottom-left corner. The value

you enter must be valid for the current graph screen. When you have completed the entry,
press b to reactivate the trace cursor.

Drawing on a Differential Equation Graph

The

GRAPH

DRAW

menu items work the same in

DifEq

graphing mode as in

Func

graphing.

DRAW

instruction coordinates are the x- and y-coordinates of the graph screen.

DrEqu

is available only in

DifEq

mode.

DrInv

is not available in

DifEq

graphing mode.

Drawing an Equation and Storing Solutions to Lists

To draw a solution on the current graph screen and store the results to specified list names,
the syntax is:

DrEqu(

xAxisVariable

yAxisVariable

xList

yList

tList

)

xAxisVariable

and yAxisVariable specify the axes on which the drawing is based; they may

differ from the current graph screen’s axes settings.

Values for

and

are

displayed on the graph to the
right because

x=t

and

y=Q

graph axes are selected.