Re: Combined Set, SetDelayed
- To: mathgroup at smc.vnet.net
- Subject: [mg100875] Re: Combined Set, SetDelayed
- From: Helen Read <hpr at together.net>
- Date: Wed, 17 Jun 2009 04:35:54 -0400 (EDT)
- References: <h0vteh$6v2$1@smc.vnet.net> <h12gck$e8s$1@smc.vnet.net> <h19hur$oqf$1@smc.vnet.net>
- Reply-to: HPR <read at math.uvm.edu>
magma wrote: > Helen Read 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. > > 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? Fair enough, but it wasn't a typo. I was merely reporting Mathematica's output. -- Helen Read University of Vermont
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