Example 4 of  solves the equation
on [0,1] with history y(t) = (-1)[- 5t ] for t £ 0.
For s > 0, the function [s] is floor(s) in
MATLAB. The history has jump discontinuities prior to t = 0 that must be set in 'Jumps'. With a delay of 1,
only jumps that occur at t ³ -1 can have an effect in [0,1].
D.R. Willé and C.T.H. Baker, DELSOL - a numerical code for
the solution of systems of delay-differential equations, Appl.
Numer. Math., 9 (1992) 223-234.