Defining a history function for Delay Differential Equations using past data points

[ChrisRackauckas]

@tom-plaa

We are told the interpolation happens internally, so defining the history function as an interpolation of our array seems to conflict with this.

You would just use an interpolation like DataInterpolations.jl for the h(p,t) that you give to the solver. That will then by used for any t < tspan[1].