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This is similar to init.m. Each time you change the ODE
ftx or one of the associated parameters/conditions, this file must
be edited, saved, and initn must be typed in the command window
(or copyandpaste at the Emporium).

 ftx is the RHS of the ODE .

 eulerfcn is the RHS of the iterating function for Euler's
method.

 hvec is a vector of step sizes that Euler's method will
use. If only one step size is needed, a number may be used instead of a
vector.

 t0, tf, x0 are the starting time, ending time, and starting
place, respectively. They will generally be given with the problem.
Observe that the axis for the Figure window ( initax) is now set
from the values t0, tf for t as well as x0 and an
estimate for x(tf).
Michael Renardy
20000512