Texas Instruments Voyage 200 User Manual page 417

Variable Description
When ncurves is used, t0 is set temporarily at the
middle of the screen and initial conditions are distributed
evenly along the y axis, where:
increment
The y values for the initial conditions are:
ymin + increment
ymin + 2
ymin + ncurves
diftol (Solution Method = RK only) Tolerance used by the RK
method to help select a step size for solving the
equation; must be
fldres (Fields = SLPFLD or DIRFLD only) Number of columns
(1 through 80) used to draw a slope or direction field
across the full width of the screen.
Estep (Solution Method = EULER only) Euler iterations
between tstep values; must be an integer >0. For more
accuracy, you can increase Estep without plotting
additional points.
dtime (Fields = DIRFLD only) Point in time at which a direction
field is drawn.
Differential Equation Graphing
ymax ymin –
= ------------------------------- -
ncurves
ù
(increment)
©
ù
(increment)
1E
‚
+ 1
14.
L
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