Texas Instruments TI-86 - Manual (Page 138)

126
Chapter 9: Parametric Graphing
09PARA.DOC TI-86, Chap 9, US English Bob Fedorisko Revised: 02/13/01 2:27 PM Printed: 02/13/01 3:02 PM Page 126 of 8 09PARA.DOC TI-86, Chap 9, US English Bob Fedorisko Revised: 02/13/01 2:27 PM Printed: 02/13/01 3:02 PM Page 126 of 8
Setting Parametric Graphing Mode
To display the mode screen, press - m. To graph parametric equations, you must
select
Param graphing mode before you enter equations, set the format, or edit window
variable values. The TI -86 retains in memory separate equation, format, and window data
for each graphing mode.
The GRAPH Menu 6
E(t)= WIND ZOOM TRACE GRAPH 4 MATH DRAW FORMT STGDB RCGDB
4 EVAL STPIC RCPIC
parametric parametric parametric
equation window graph math
editor editor menu
Displaying the Parametric Equation Editor
To display the parametric equation editor, select E(t)= from the GRAPH menu in Param graphing
mode (6 &). The equation editor menu displayed on the bottom line is the same as the
Func -mode equation editor menu, except that t and xt replace x and y , and yt displaces INSf .
In this editor, you can enter and display both the x and y
components of up to 99 parametric equations,
xt1 and yt1
through xt99 and yt99 , if sufficient memory is available.
Each is defined in terms of the independent variable t .
Two components, x and y , define a single parametric
equation. You must define both xt and yt for each equation.
The default graph style is » (line) in Param mode. ¾ (shade above) and ¿ (shade below)
graph styles are not available in Param mode.
Chapter 5 describes these
GRAPH
menu items:
GRAPH and FORMT.
Chapter 6 describes these
GRAPH
menu items:
ZOOM , TRACE, DRAW,
STGDB , RCGDB, EVAL,
STPIC , and RCPIC.
A common application of
parametric graphs is
graphing equations over time.