% D.R. Wille' and C.T.H. Baker use Example 4 of DELSOL--a numerical code
% for the solution of systems of delay-differential equations, Appl.
% Numer. Math., 9 (992) 223-234 to illustrate a discontinuous history.
% DDE23 treats any order discontinuity in the history as a discontinuity 
% in the solution itself, which is actually the case for this example.

opts = ddeset('Jumps',[-1,-4/5,-3/5,-2/5,-1/5]);
sol = dde23('exer5f',1,'exer5h',[0, 1],opts);

plot(sol.x,sol.y)
title('Example 4 of Wille'' and Baker.')
xlabel('time t');
ylabel('y(t)');