Re: [Visualpython-users] Errors running Vpython on OSX

[Bruce S. <bas...@un...>]

doublependulum.py is part of the standard VPython demo suite. All the demos
work on other OSX machines.

Bruce Sherwood

----- Original Message -----
From: "Andy Dougherty" <dou...@la...>
To: "Bruce Sherwood" <bas...@un...>
Cc: "Andy Dougherty" <dou...@ma...>;
<cb...@sw...>; <vis...@li...>
Sent: Friday, October 04, 2002 3:20 PM
Subject: Re: [Visualpython-users] Errors running Vpython on OSX


> On Fri, 4 Oct 2002, Bruce Sherwood wrote:
>
> > This vague possibility would seem to be ruled out by the fact that these
> > programs run on other people's Mac OSX machines, with presumably the
same
> > math libraries, no?
>
> Not quite, unless I've misunderstood the original poster's question.
> Yes, Vpython runs fine on other people's Mac OS X machines, but I'm
> unclear if this particular script runs fine on other people's Mac OS X
> machines.
>
> > > > Traceback (most recent call last):
> > > >   File "doublependulum.py", line 71, in ?
> > > >     atheta2 = -(A*atheta1+C*sin(theta1))/B
> > > > ValueError: unexpected math error
>
> What I'm imagining is that the user is simulating a (possibly damped,
> driven) double pendulum that might have swung over many many times, so
> that theta1 and/or theta2 might be very large compared to 2 pi.  That's
> the sort of thing I've seen eventually lead to odd problems elsewhere.
>
> Perhaps if the original script were posted, others could test it.
>
> --
>     Andy Dougherty dou...@la...
>     Dept. of Physics
>     Lafayette College, Easton PA 18042
>
>