Mathematica 9 is now available
Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2009

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Combined Set, SetDelayed

  • To: mathgroup at smc.vnet.net
  • Subject: [mg100837] Re: Combined Set, SetDelayed
  • From: magma <maderri2 at gmail.com>
  • Date: Tue, 16 Jun 2009 21:48:47 -0400 (EDT)
  • References: <h0vteh$6v2$1@smc.vnet.net> <h12gck$e8s$1@smc.vnet.net>

On Jun 15, 11:37 am, Helen Read <h... at together.net> wrote:
> AES wrote:
> > Helen Read <h... at together.net>
> > wrote:
>
> >> 0.811 seconds. The second version, using the function that remembers
> >> values, took only 1.87003*10^-15 seconds.
>
> > The frequency of visible light is around 3*10^14 Hz, so that's around
> > one period of a visible light wave.  Is there maybe a typo here?
>
> No, no typo. Not sure what your point is.
>
> --
> Helen Read
> University of Vermont

I think AES point is that this timing figure seems a bit too unrealistic.
I personally got a timing of 1.33357*10^-17 sec. About 100 times faster!
Now, a light signal - regardless of frequency - travels a distance of
about 40 angstrom during that time.
Is this meaningful or is it just a way for Mathematica to say that the
operation was too fast to be timed properly?


  • Prev by Date: Matrices, TraditionalForm and Two Equal Signs
  • Next by Date: erroneous result when adding reals
  • Previous by thread: Re: Combined Set, SetDelayed
  • Next by thread: Re: Re: Combined Set, SetDelayed