Texas Instruments PLUS TI-89 - Manual (Page 229)

212 Chapter 12: Additional Graphing Topics
12ADDLGR.DOC TI-89/TI-92 Plus: Additional Graphing Tools (English) Susan Gullord Revised: 02/23/01 1:03 PM Printed: 02/23/01 2:15 PM Page 212 of 20
Execute DrawFunc , DrawParm , or DrawPol from the Home screen or
a program. You cannot draw a function or equation interactively
from the Graph screen.
DrawFunc expression
DrawParm expression1 , expression2 [, tmin ] [, tmax ] [, tstep ]
DrawPol expression [, qmin ] [, qmax ] [, qstep ]
For example:
1. Define y1(x)=.1x òì 2x+6 on the
Y= Editor, and graph the
function.
2. On the Graph screen, press:
TI - 89 : 2 ˆ
TI - 92 Plus : ˆ
and select 2:DrawFunc .
3. On the Home screen, specify
the function to draw.
DrawFunc y1(x)ì6
4. Press ¸ to draw the
function on the Graph
screen.
You cannot trace, zoom, or
perform a math operation on
a drawn function.
Execute DrawInv from the Home screen or a program. You cannot
draw an inverse function interactively from the Graph screen.
DrawInv expression
For example, use the graph of y1(x)=.1x òì 2x+6 as shown above.
1. On the Graph screen, press:
TI - 89: 2 ˆ
TI - 92 Plus: ˆ
and select 3:DrawInv .
2. On the Home screen, specify
the inverse function.
DrawInv y1(x)
3. Press ¸.
The inverse is plotted as
(
y,x ) instead of ( x,y ).
Drawing a Function or Inverse on a Graph
For comparison purposes, you may want to draw a function
over your current graph. Typically, the drawn function is some
variation of the graph. You can also draw the inverse of a
function. (These operations are not available for 3D graphs.)
Drawing a Function,
Parametric, or Polar
Equation
To display the Home screen
and put DrawFunc in the
entry line, press:
TI
- 89 : 2 ˆ 2
TI - 92 Plus : ˆ 2
Tip: To clear the drawn
function, press
†
— or —
TI - 89: 2 ˆ and select
1:ClrDraw .
TI - 92 Plus: ˆ and select
1:ClrDraw .
Drawing the Inverse
of a Function
To display the Home screen
and put DrawInv in the
entry line, press:
TI
- 89: 2 ˆ 3
TI - 92 Plus: ˆ 3