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Moving the trace cursor to a theta value, Using zoom operations – Texas Instruments TI-86 User Manual

Page 133

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Chapter 8: Polar Graphing

121

08POL.DOC TI-86, Chap 8, US English Bob Fedorisko Revised: 02/13/01 2:26 PM Printed: 02/13/01 3:02 PM Page 121 of 8

08POL.DOC TI-86, Chap 8, US English Bob Fedorisko Revised: 02/13/01 2:26 PM Printed: 02/13/01 3:02 PM Page 121 of 8

Moving the Trace Cursor to a

q Value

To move the trace cursor to any valid

q

value on the current equation, enter the number.

When you enter the first digit, a

q

=

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.

Using Zoom Operations

The

GRAPH

ZOOM

menu items, except

ZFIT

, work the same in

Pol

graphing as in

Func

graphing. In

Pol

graphing mode,

ZFIT

adjusts the graph screen in both the x and y directions.

The zoom operations affect only the

x

window variables (

xMin

,

xMax

, and

Xscl

) and the

y

window variables (

yMin

,

yMax

, and

yScl

), except

ZSTO

and

ZRCL

, which also affect the

q

window variables (

q

Min

,

q

Max

, and

q

Step

).

In the example, r1=8sin(2.5

q

)

is graphed.

Values for

q

, x, and y are

displayed on the graph to the
right because RectGC graph
format is selected.