Texas Instruments TITANIUM TI-89 - Manual (Page 416)

Differential Equation Graphing 416
Window Variables Window Variables Window 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
ù
tstep)
... 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.