Texas Instruments TI-89 Manuel D’Utilisation
Parametric Graphing
353
„
Zoom
Works just as it does for function graphs, with the
following exceptions:
following exceptions:
•
Only
x
(
xmin
,
xmax
,
xscl
) and
y
(
ymin
,
ymax
,
yscl
)
Window variables are affected.
•
The
t
Window variables (
tmin
,
tmax
,
tstep
) are not
affected unless you select
6:ZoomStd
(which sets
tmin = 0
,
tmax = 2
p
, and
tstep =
p
/24
).
…
Trace
Lets you move the cursor along a graph one tstep at a
time.
time.
•
When you begin a trace, the cursor is on the first
selected parametric equation at
selected parametric equation at
tmin
.
•
QuickCenter applies to all directions. If you move the
cursor off the screen (top or bottom, left or right), press
cursor off the screen (top or bottom, left or right), press
¸
to center the viewing window on the cursor
location.
•
Automatic panning is not available. If you move the
cursor off the left or right side of the screen, the TI-89
Titanium will not automatically pan the viewing window.
However, you can use QuickCenter.
cursor off the left or right side of the screen, the TI-89
Titanium will not automatically pan the viewing window.
However, you can use QuickCenter.
‡
Math
Only 1:Value, 6:Derivatives, 9:Distance, A:Tangent,
and B:Arc are available for parametric graphs. These
tools are based on t values. For example:
and B:Arc are available for parametric graphs. These
tools are based on t values. For example:
•
1:Value
displays x and y values for a specified
t
value.
•
6:Derivatives
finds
dy/dx
,
dy/dt
, or
dx/dt
at a point
defined for a specified
t
value.
Tool
For Parametric Graphs: