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I have a problem using the MATLAB dde23 solver to evaluate the delayed HR model:

dx/dt = y(t) - a*x(t)^3 + b*x(t)^2 - z(t) + e (x(t-tau) - x(t))

dy/dt = c - d*x(t)^2 - y(t)

dz/dt = r [ s*(x(t) - xo) - z(t)]

how could I set the history values (-tau<t<0)?

it is possible use the dde23 solver or I must use some approximation? if so what's the best approximation method?

please help me.

tnx