5–6 Polar Graphing
825C44~1.DOC TI-83 international English Bob Fedorisko Revised: 10/26/05 1:20 PM Printed: 10/27/05 2:00
PM Page 6 of 6
The free-moving cursor in Pol graphing works the same as in
Func graphing. In RectGC format, moving the cursor updates
the values of
X and Y; if CoordOn format is selected, X and Y
are displayed. In PolarGC format, X, Y, R, and q are updated; if
CoordOn format is selected, R and q are displayed.
To activate
TRACE, press r. When TRACE is active, you
can move the trace cursor along the graph of the equation one
qstep at a time. When you begin a trace, the trace cursor is on
the first selected function at
qmin. If ExprOn format is selected,
then the equation is displayed.
In
RectGC format, TRACE updates the values of X, Y, and q; if
CoordOn format is selected, X, Y, and q are displayed. In
PolarGC format, TRACE updates X, Y, R, and q; if CoordOn
format is selected, R and q are displayed.
To move five plotted points at a time on a function, press y
| or y ~. If you move the trace cursor beyond the top or
bottom of the screen, the coordinate values at the bottom of the
screen continue to change appropriately.
Quick Zoom is available in
Pol graphing mode; panning is not
(Chapter 3).
To move the trace cursor to any valid
q value on the current
function, enter the number. When you enter the first digit, a
q=
prompt and the number you entered are displayed in the bottom-
left corner of the screen. You can enter an expression at the
q=
prompt. The value must be valid for the current viewing
window. When you complete the entry, press Í to move
the cursor.
ZOOM operations in Pol graphing work the same as in Func
graphing. Only the X (Xmin, Xmax, and Xscl) and Y (Ymin,
Ymax, and Yscl) window variables are affected.
The
q window variables (qmin, qmax, and qstep) are not affected,
except when you select
ZStandard. The VARS ZOOM secondary
menu
ZT/Zq items 4:Zqmin, 5:Zqmax, and 6:Zqstep are zoom
memory variables for
Pol graphing.
CALC operations in Pol graphing work the same as in Func
graphing. The CALCULATE menu items available in Pol
graphing are 1:value, 2:dy/dx, and 3:dr/dq.
Exploring Polar Graphs
Free-Moving
Cursor
TRACE
Moving the Trace
Cursor to Any
Valid q Value
ZOOM
CALC
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