Defining Functions For Graphing - Texas Instruments TI-89 Titanium User Manual

Graph Mode Setting
POLAR
SEQUENCE
3D
DIFFERENTIAL EQUATION
Angle Mode
When using trigonometric functions, set the Angle mode for the units (RADIAN or
DEGREE) in which you want to enter and display angle values.
Checking the Status Line
To see the current Graph mode and Angle mode, check the status line at the bottom of
the screen.

Defining Functions for Graphing

In FUNCTION graphing mode, you can graph functions named
define and edit these functions, use the Y= Editor. (The Y= Editor lists function names for
Basic Function Graphing
Description
r( ) polar equations
q
u(n) sequences
z(x,y) 3D equations
y'(t) differential equations
Angle
Mode
Graph
Mode
through
y1(x) y99(x)
. To
291