Texas TI-86 用户手册
Chapter 9: Parametric Graphing
127
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 127 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 127 of 8
Selecting and Deselecting a Parametric Equation
When a parametric equation is selected, the equals signs (
=
) of both
xt
and
yt
are highlighted.
To change the selection status of a parametric equation, move the cursor onto either
xt
or
yt
, and then select
SELCT
from the equation editor menu. The status is changed for
xt
and
yt
.
Deleting a Parametric Equation
To delete a parametric equation using
DELf
, move the cursor to either
xt
or
yt
, and then
select
DELf
from the equation editor menu. Both components are deleted.
To delete a parametric equation using the
MEM
DELET
menu (Chapter 17), you must select
the
xt
component. If you select the
yt
component, the equation is retained in memory.
Setting the Graph Screen Window Variables
To display the parametric window editor, select
WIND
from
the
GRAPH
menu (6 ').
Param
graphing mode has the
same window variables as
Func
graphing mode, except:
♦
xRes
is not available in
Param
mode.
♦
tMin
,
tMax
, and
tStep
are available in
Param
mode.
The values shown in the picture to the right are the
defaults in
defaults in
Radian
mode.
$
indicates that
yMin=
L
10
,
yMax=10
, and
yScl=1
are beyond the screen.
tMin=0
Specifies the starting
t
value
tMax=6.28318530718
Specifies the ending
t
value
tStep=.13089969389957
Specifies the increment from one
t
value to the next
tMax
default is 2
p
.
tStep
default is
pà
24.