%{
m-file to solve Boyce an DiPrima Section 2.3
problem 15.

The last input is the initial value Y(0).  Seek
an initial value so that Y(2*pi) is equal
to Y(0).  Start with Y(0)=1.
%}

[T,Y]=ode45('sardine', [0,2*pi], 1);

plot(T,Y)