Operation Manual

5-6 Polar Graphing
8205POLR.DOC TI-82, Chapter 5, English Bob Fedorisko Revised: 02/09/01 9:09 AM Printed: 02/09/01
12:37 PM Page 6 of 6
Exploring a Polar Graph
As in function graphing, three tools are available for exploring a graph: using the
free-moving cursor, tracing an equation, and zooming.
Free-Moving Cursor
The free-moving cursor works in
Pol
graphing just as it does in
Func
graphing. In
RectGC
FORMAT
, moving the cursor updates and displays (if
FORMAT
is
CoordOn
) the values of
X
and
Y
. (In
PolarGC
FORMAT
,
X
,
Y
,
R
,
and
q
are updated, and
R
and
q
are displayed.)
TRACE
TRACE
lets you move the cursor along the equation one
q
step
at a time.
When you begin a trace, the cursor is on the first selected equation at
q
min
.
The number of the equation shows in the upper right of the display.
In
RectGC
FORMAT
,
TRACE
updates and displays (if
FORMAT
is
CoordOn
)
the values of
X
,
Y
, and
q
. (In
PolarGC
FORMAT
,
X
,
Y
,
R
, and
q
are updated,
and
R
and
q
are displayed.)
If the cursor moves off the top or bottom of the screen, the coordinate
values at the bottom of the screen continue to change appropriately.
y |
and
y ~
move the
TRACE
cursor five plotted points at a time. The
TRACE
cursor remains in the same location if you leave
TRACE
and return,
if Smart Graph has not caused the graph to be replotted.
QuickZoom is available in
Pol
graphing, but panning is not.
ZOOM
ZOOM
operations work in
Pol
graphing as they do in
Func
graphing. Only
the
X
(
Xmin
,
Xmax
, and
Xscl
) and
Y
(
Ymin
,
Ymax
, and
Yscl
)
WINDOW
variables are affected. The
q
WINDOW
variables (
q
min
,
q
max
, and
q
step
)
are not affected, except when you select
ZStandard
(
q
min
= 0,
q
max
= 2
p
,
and
q
step
=
pà
24). The
ZOOM MEMORY
variables in
Pol
graphing include
Z
q
min
,
Z
q
max
, and
Z
q
step
.
CALC
CALC
operations work in
Pol
graphing as they do in
Func
graphing. The
CALC
operations available in
Pol
graphing are
value
,
dy/dx
, and
dr/d
q
.