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Here I have removed the
combine_listsfunction and replaced it withmodifyListto avoid replicating part of base R.A key difference between these functions is that the second argument to
modifyListmust be a list, whilecombine_listsallowed it to beNULL. If the user does not supply driver-specific parameters or initial values, thenddp[['parameters']]orddp[['initial_values']]isNULL, causing a problem. To fix this, I changed these arguments toc(list(), ddp[['parameters']]), etc, which ensures that a (potentially empty) list is always passed.This is in response to a comment from Justin: #16 (comment)