[From Bill Powers (980526.1625 MDT)]
I'm blowing off the last couple of days' messages -- they just call for
speculation anyway, so nothing I would say would be important.
I'm happy to report that the inverted-pendulum control system simulation is
working like a dream, somewhat to my surprise. It won't yet bring a
pendulum from the dangling position to a balance in the upright position,
but I've been looking at other people's approaches (do a Yahoo search on
<inverted pendulum control>) and I don't believe they do it either. What
mine does do is let you use the mouse to set a reference position for the
bob, and the cart moves to put the bob there, very quickly and without
overshoot or unnecessary undershoot. The "official" method is unbelievably
complex and nonintuitive, and it doesn't work real well, either.
The writeup for the conference is done, and it looks as though I'll have
copies of the paper to hand out. I'll post everything when I get back.