HP 39g Graphing Calculator - Manual (Page 243)

Tmin / Tmax Defines the minimum and maximum independent variable
Parametric values. Appears as the TRNG field in the Plot Setup input
forni.
From Plot Setup, enter values for TRNG.
or
In a program, type
iij ► Train
n~, ► Tmax
where ii 2 >
Tracing
All Aplets
Tstep
Parametric
Xcross
All Aplets
Ycross
All Aplets
Turns tracing mode on or off in Plot view.
In a program, type
1 ► Tracing—to turn Tracing mode on (default).
0 ► Tracing—to turn Tracing mode off.
Defines the step size for an independent variable.
From the Plot Setup input form, enter values for TSTEP.
or
In a program, type
n ► Tstep
where n>0
Defines the horizontal coordinate of crosshairs. Only works
with TRACE off.
In a program, type
n► Xcross
Defines the vertical coordinate of crosshairs. Only works with
TRACE off.
In a program, type
n ► Ycross
Programming 15-35