Operation Manual

Chapter 4: Parametric Graphing 100
In RectGC format, TRACE updates and displays the values of X, Y, and T if CoordOn format is on.
In
PolarGC format, X, Y, R, q and T are updated; if CoordOn format is selected, R, q, and T are displayed.
The X and Y (or R and q) values are calculated from T.
To move five plotted points at a time on a function, press y| or y~. If you move the cursor
beyond the top or bottom of the screen, the coordinate values at the bottom of the screen continue to
change appropriately.
Quick Zoom (see Chapter 3) is available in parametric graphing; panning is not.
Moving the Trace Cursor to Any Valid T Value
To move the trace cursor to any valid T value on the current function, press r, enter the number.
When you enter the first digit, a
T= prompt and the number you entered are displayed in the bottom-
left corner of the screen. You can enter an expression at the T= prompt. The value must be valid for the
current viewing window. When you have completed the entry, press Í to move the cursor.
ZOOM
ZOOM operations in parametric graphing work the same as in Func graphing. Only the X (Xmin, Xmax,
and
Xscl) and Y (Ymin, Ymax, and Yscl) window variables are affected.
The
T window variables (Tmin, Tmax, and Tstep ) are only affected when you select ZStandard. The
VARS ZOOM secondary menu ZT/Zq items 1:ZTmin, 2:ZTmax, and 3:ZTstep are the zoom memory
variables for parametric graphing.
CALC
CALC operations in parametric graphing work the same as in Func graphing. The CALCULATE menu
items available in parametric graphing are
1:value, 2:dy/dx, 3:dy/dt, and 4:dx/dt.