Texas Instruments PLUS TI-89 - Manual (Page 125)

108 Chapter 6: Basic Function Graphing
06BASFUN.DOC TI-89/TI-92 Plus: Basic Function Graphing (English) Susan Gullord Revised: 02/23/01 4:09 PM Printed: 02/23/01 4:18 PM Page 108 of 22
1. Press 3 to display the MODE dialog box, which shows the
current mode settings.
2. Set the Graph mode to FUNCTION . Refer to “Setting Modes” in
Chapter 2.
While this chapter specifically describes y(x) function graphs, the
TI -89 / TI-92 Plus lets you select from six Graph mode settings.
Graph Mode Setting Description
FUNCTION y(x) functions
PARAMETRIC x(t) and y(t) parametric equations
POLAR r( q ) polar equations
SEQUENCE u(n) sequences
3D z(x,y) 3D equations
DIFFERENTIAL EQUATION y'(t) differential equations
When using trigonometric functions, set the Angle mode for the units
( RADIAN or DEGREE ) in which you want to enter and display angle
values.
To see the current Graph mode and Angle mode, check the status line
at the bottom of the screen.
Setting the Graph Mode
Before graphing y(x) functions, you must select FUNCTION
graphing. You may also need to set the Angle mode, which
affects how the
TI - 89 / TI - 92 Plus graphs trigonometric functions.
Graph Mode
Note: For graphs that do not
use complex numbers, set
Complex Format = REAL.
Otherwise, it may affect
graphs that use powers,
such as x
1/3 .
Note: Other Graph mode
settings are described in
later chapters.
Angle Mode
Checking the
Status Line
Angle
Mode Graph
Mode