Texas Instruments TITANIUM TI-89 User Manual page 353

Tool For Parametric Graphs:
„
Works just as it does for function graphs, with the
Zoom
following exceptions:
•
•
...
Lets you move the cursor along a graph one tstep at a
Trace
time.
•
•
•
‡
Only 1:Value, 6:Derivatives, 9:Distance, A:Tangent,
Math
and B:Arc are available for parametric graphs. These
tools are based on t values. For example:
•
•
Parametric Graphing
x xmin xmax
Only ( ,
Window variables are affected.
t
The Window variables (
affected unless you select
tmin = 0 tmax = 2 p
,
When you begin a trace, the cursor is on the first
selected parametric equation at
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.
1:Value
displays x and y values for a specified
6:Derivatives
finds
defined for a specified
xscl y ymin
, ) and ( ,
tmin tmax tstep
, ,
6:ZoomStd
(which sets
tstep = p /24
, and ).
tmin
.
dy/dx dy/dt dx/dt
, , or
t
value.
ymax yscl
, )
) are not
t
value.
at a point
353