Texas Instruments Titanium TI-89 User Manual

Differential Equation Graphing 416
Window Variables
Window VariablesWindow Variables
Window Variables
Differential equation graphs use the following Window variables. Depending on the
Solution Method and Fields graph formats, not all of these variables are listed in the
Window Editor (8$) at the same time.
Axes Description
TIME Plots t on the x axis and y (the solutions to the selected
differential equations) on the y axis.
CUSTOM Lets you select the x and y axes.
Variable Description
t0 Time at which the initial conditions entered in the Y= Editor
occur. You can set t0 in the Window Editor and Y= Editor.
(If you set t0 in the Y= Editor, tplot is set to the same value
automatically.)
tmax, tstep Used to determine the t values where the equations are
plotted:
y'(t0)
y'(t0+tstep)
y'(t0+2
ùtstep)
... not to exceed ...
y'(tmax)
If Fields = SLPFLD, tmax is ignored. Equations are plotted
from t0 to both edges of the screen in tstep increments.

Texas Instruments Titanium TI-89 Specifications

General

Display Type	LCD
Display Resolution	160 x 100 pixels
Memory	188 KB RAM, 2.7 MB Flash ROM
Type	Graphing Calculator
Display	Monochrome
Processor	Motorola 68000
Processor Speed	12 MHz
Power Source	4 AAA batteries
Connectivity	USB
Programming	TI-BASIC, Assembly
Operating System	AMS (Advanced Mathematics Software)