Re: [Phys-l] True Basic limitation and numerical model

[Scott Goelzer <s.goelzer@comcast.net>]

I use RealBasic for a few years now, should be an easy transition.

<http://www.realsoftware.com/> They have a free trial and academic  
pricing.

Scott


On Sep 22, 2007, at 4:34 PM, Bernard Cleyet wrote:

> I've used true basic for several years satisfactorily (since Ludwik
> suggest it), but now can't because its output is limited to about 500
> lines.  I'm numerically modelling a spring oscillator support for a
> simple pendulum.  I suppose I could adjust the parameters so the
> transfer of energy back and forth was faster, but I also want to
> duplicate the experiments of another where the support mass "flip
> flops".  Does any one know of an inexpensive basic that will allow  
> me to
> output much longer than ten seconds w/ 20 milisec. intervals?  This is
> using a Power Book G4.
>
> I'm using the "leapfrog" method w/ a very simplified pair of equations
> (A.P. French).  One of the experiments involves large amplitudes (The
> support mass flip flops).  It's not obviously to me how to model the
> necessary equations which each contain not only the two co- 
> ordinates and
> their first derivatives, but also the second.  The simplified  
> couple has
> the second derivatives separated.
>
>
> bc, maths challenged
>
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