Differential Equation Graphing 417
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:
The y values for the initial conditions are:
ymin + increment
ymin + 2ù(increment)
©
ymin + ncurvesù(increment)
diftol (Solution Method = RK only) Tolerance used by the RK
method to help select a step size for solving the
equation; must be
‚1EL14.
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.
Variable Description
increment
ymax ymin–
ncurves 1+
--------------------------------=
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