Texas Instruments TI-86 - Manual (Page 139)

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
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 pа 24.