Texas Instruments TI-86 - Manual (Page 157)

Chapter 10: Differential Equation Graphing
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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 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 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 t value on the current equation, enter the number.
When you enter the first digit, a t= 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 ã , xList , yList , tList ä )
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 t and Q are
displayed on the graph to the
right because x=t and y=Q
graph axes are selected.