32 bit or 64 bit?

[ram.rachum at gmail.com]

On Jun 18, 7:12 pm, Peter Pearson <ppear... at nowhere.invalid> wrote:
> On Tue, 17 Jun 2008 08:13:40 -0400, Phil Hobbs wrote:
> > ram.rac... at gmail.com wrote:
> [snip]
> >> I have a physical system set up in which a body is supposed to
> >> accelerate and to get very close to lightspeed, while never really
> >> attaining it. After approx. 680 seconds, Python gets stuck and tells
> >> me the object has passed lightspeed. I put the same equations in
> >> Mathematica, again I get the same mistake around 680 seconds. So I
> >> think, I have a problem with my model! Then I pump up the
> >> WorkingPrecision in Mathematica to about 10. I run the same equations
> >> again, and it works! At least for the first 10,000 seconds, the object
> >> does not pass lightspeed.
> >> I concluded that I need Python to work at a higher precision.
> [snip]
> > You need to change your representation.  Try redoing the algebra using
> > (c-v) as the independent variable, and calculate that.
>
> Or represent the velocity as c*tanh(b), where b is the independent
> variable.  If memory serves, this is the representation in which
> constant acceleration corresponds to db/dt = constant.
>
> --
> To email me, substitute nowhere->spamcop, invalid->net.

See my comment to Brodie.