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3-2 Function Graphing
8303FUNC.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 12:16 PM Printed: 02/19/01 1:35
PM Page 2 of 28
8303FUNC.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 12:16 PM Printed: 02/19/01 1:35
PM Page 2 of 28
Getting Started is a fast-paced introduction. Read the chapter for details.
Graph a circle of radius 10, centered on the origin in the standard viewing
window. To graph this circle, you must enter separate formulas for the upper
and lower portions of the circle. Then use
ZSquare (zoom square) to adjust the
display and make the functions appear as a circle.
1. In
Func mode, press
o
to display the
Y=
editor. Press
y
ã
‡
ä
100
¹
„
¡
¤
Í
to enter the expression Y=
‡
(100
N
X
2
),
which defines the top half of the circle.
The expression Y=
L‡
(100
N
X
2
) defines the
bottom half of the circle. On the TI
-
83, you
can define one function in terms of another.
To define
Y
2
=
L
Y
1
, press
Ì
to enter the
negation sign. Press
~
to display the
VARS Y
.
VARS
menu. Then press
Í
to
select
1:Function. The
FUNCTION
secondary
menu is displayed. Press
1 to select 1:Y
1
.
2. Press
q
6 to select 6:ZStandard. This is a
quick way to reset the window variables to
the standard values. It also graphs the
functions; you do not need to press
s
.
Notice that the functions appear as an
ellipse in the standard viewing window.
3. To adjust the display so that each pixel
represents an equal width and height, press
q
5 to select 5:ZSquare. The functions
are replotted and now appear as a circle on
the display.
4. To see the ZSquare window variables, press
p
and notice the new values for
Xmin,
Xmax, Ymin, and Ymax.
Getting Started: Graphing a Circle