Mon Jan 24 19:22:33 EST 2011

Composite Models

Now, instead of working with the models + connections approach, we can
still use the lexical direct-dag approach as a basic device, using the
composition form only to perform the state threading, which eventually
becomes the most important bookkeeping part as state accumulates,
while input/outputs are reduced through connections.

The problem then is state initialization: it becomes hard to track
what corresponds to what..  Starting all states at zero solves this,
but it might be too restrictive.  Overall: it's a huge pain to handle
and there is little real gain when it's left flexible, and if initial
state is really a problem, state equations can be translated such that
they start at different initial conditions.

However, by carefully naming the states, i.e. recursive prefixing,
this can be handled properly.