Please remove me from this mailing list.
Thank you
Hi, Clark --
Does this mean you're getting ready to come home?
At any rate, you'd better re-send your "unsubscribe" message, only this
time send it to
listserv@postoffice.cso.uiuc.edu
Best,
Bill P.
unsubscribe
···
From: Bruce Abbott
Sent: Thursday, December 31, 2015 9:17 PM
To: csgnet@lists.illinois.edu
Subject: RE: Little Man Demo’s model of the arm
Thanks, Adam, I had totally forgotten about the Byte article! Happy new year!
Bruce
From: Adam Matic [mailto:adam.matic@gmail.com]
Sent: Thursday, December 31, 2015 12:36 PM
To: csgnet@lists.illinois.edu
Subject: Re: Little Man Demo’s model of the arm
Hi Bruce, happy new year!
There is the byte article from '79 with Basic source code, models three muscles that can only pull. It is possible to set total tendon tension to make isometric contractions, or to set central point position to make isotonic contractions. http://www.livingcontrolsystems.com/enclosures/byte_aug_1979.pdf
I’ve ported it to Processing a year or two ago, but I’m afraid I’ve lost the source code. I’ll see on my old laptop, maybe there is a folder…
Best to all,
Adam
Dana 31. 12. 2015. 17:16 osoba “Bruce Abbott” bbabbott@frontier.com napisala je:
[From Bruce Abbott (2015.12.31.1115 EST)]
Happy New Year to all!
This post is directed mainly toward the âold-timersâ? of PCT. In Bill Powersâ âLittle Manâ? demo, Version 2 modeled Level 1 system used to control muscle length and force. (These were not modeled in Version 1). However, to simplify the computations Bill chose to model the pairs of opposing (retractor versus extensor) muscles – each of which is capable only of pulling – as if they were a single muscle capable of both pulling and pushing. Unfortunately, this simplification eliminates the possibility for isometric contraction (in which the extensor and retractor muscles oppose each otherâs actions).
My question is, to anyoneâs knowledge, did Bill ever work on a model in which opposing muscles are represented separately, so that isometric contraction becomes possible?
Bruce A.
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