Well, I'd hope it was only because I don't understand the physical system or the model invloved, but it seems from what you're saying that the diagram was actually just a model of an argument about a model and a system. That makes it much harder for it to display an *interesting* way in which a real model fails to fit a real system. Is that right?
Phil Henshaw ¸¸¸¸.·´ ¯ `·.¸¸¸¸ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 680 Ft. Washington Ave NY NY 10040 tel: 212-795-4844 e-mail: [EMAIL PROTECTED] explorations: www.synapse9.com > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Marcus G. Daniels > Sent: Saturday, December 08, 2007 12:24 PM > To: The Friday Morning Applied Complexity Coffee Group > Subject: Re: [FRIAM] FRIAM and causality > > > Glen wrote: > > No. Adjusting a rule is entirely different from adjusting > a number. > > The adjustment of a number merely explores a space. A > number spectrum > > does specify/describe a metric. So, for example, adjusting > an integer > > with particular boundaries for the model, say [-10, 100] provides a > > well-defined space. > For a fixed instruction set there's a fixed set of programs > that can be > encoded in a fixed sized vector. The behaviors that such a > program can > exhibit are also entirely fixed given precise initial state. General > and effective methods for global search can in fact be > exactly the same > for numbers and rules: 0) create a set of starting candidates 1) > evaluate them, 2) tweak the good 3) destroy the bad, 4) go to 1. > > To have good optimizations for searching number spaces (more > efficient > than exhaustive grid search), then additional assumptions need to be > made, such as that the numbers come from a differentiable function or > have systematic gradients. For that matter [-10, 100] is not a well > defined space for a model because there are no units, and no given > meaning to how that range ought to relate to sensitivities in > other agents. > > An agent model is an assembly. If a component of the assembly is > tweaked a bit, that doesn't justify calling it a whole new model any > more than if a few parameters in the model changed a bit. It is a > versioning issue. > > Marcus > > ============================================================ > FRIAM Applied Complexity Group listserv > Meets Fridays 9a-11:30 at cafe at St. John's College > lectures, archives, unsubscribe, maps at http://www.friam.org > > ============================================================ FRIAM Applied Complexity Group listserv Meets Fridays 9a-11:30 at cafe at St. John's College lectures, archives, unsubscribe, maps at http://www.friam.org
