Texas Instruments TITANIUM TI-89 - 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: