def __init__(self, regimes=None, aliases=None, state_variables=None):
"""Dynamics object constructor
:param aliases: A list of aliases, which must be either |Alias|
objects or ``string``s.
:param regimes: A list containing at least one |Regime| object.
:param state_variables: An optional list of the state variables,
which can either be |StateVariable| objects or `string` s. If
provided, it must match the inferred state-variables from the
regimes; if it is not provided it will be inferred
automatically.
"""
aliases = normalise_parameter_as_list(aliases)
regimes = normalise_parameter_as_list(regimes)
state_variables = normalise_parameter_as_list(state_variables)
# Load the aliases as objects or strings:
alias_td = filter_discrete_types(aliases, (basestring, Alias))
aliases_from_strs = [StrToExpr.alias(o) for o in alias_td[basestring]]
aliases = alias_td[Alias] + aliases_from_strs
# Load the state variables as objects or strings:
sv_types = (basestring, StateVariable)
sv_td = filter_discrete_types(state_variables, sv_types)
sv_from_strings = [StateVariable(o) for o in sv_td[basestring]]
state_variables = sv_td[StateVariable] + sv_from_strings
self._regimes = regimes
self._aliases = aliases
self._state_variables = state_variables
