Operation Manual

4-6 Parametric Graphing
8204PARA.DOC TI-82, Chapter 4, English Bob Fedorisko Revised: 02/09/01 9:08 AM Printed: 02/09/01
12:37 PM Page 6 of 6
Exploring a Parametric 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
Par
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
Tstep
at a time.
When you begin a trace, the cursor is on the first selected equation at
Tmin
.
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
T
. (In
PolarGC
FORMAT
,
X
,
Y
,
R
,
q
and
T
are
updated, and
R
,
q
, and
T
are displayed.) The
X
and
Y
(or
R
and
q
) values are
calculated from
T
.
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
Par
graphing, but panning is not.
ZOOM
ZOOM
operations work in
Par
graphing as they do in
Func
graphing. Only
the
X
(
Xmin
,
Xmax
, and
Xscl
) and
Y
(
Ymin
,
Ymax
, and
Yscl
)
WINDOW
variables are affected.
T
WINDOW
variables (
Tmin
,
Tmax
, and
Tstep
) are
not affected, except when you select
ZStandard
(
Tmin
= 0,
Tmax
= 2
p
, and
Tstep
=
pà
24).
ZOOM MEMORY
variables in
Par
graphing include
ZTmin
,
ZTmax
, and
ZTstep
.
CALC
CALC
operations work in
Par
graphing as they do in
Func
graphing.
CALC
operations available in
Par
graphing are
value
,
dy/dx
,
dy/dt
, and
dx/dt
.