Texas Instruments TITANIUM TI-89 User Manual
Page 353
Parametric Graphing
353
„
Zoom
Works just as it does for function graphs, with the
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.
•
When you begin a trace, the cursor is on the first
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
¸
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.
‡
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:
•
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: