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Re: Manually nested Tables faster than builtin nesting?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg113426] Re: Manually nested Tables faster than builtin nesting?
  • From: Tomas Garza <tgarza10 at msn.com>
  • Date: Thu, 28 Oct 2010 04:26:50 -0400 (EDT)

You must have a very fast machine! Any way, I get 5.647 and 43.134, respectively. The factor in both machines is close to 8, not 2 (what do you mean manually?)

-Tomas

> Date: Wed, 27 Oct 2010 05:13:59 -0400
> From: sschmitt at physi.uni-heidelberg.de
> Subject: [mg113391] Manually nested Tables faster than builtin nesting?
> To: mathgroup at smc.vnet.net
>
> Dear all!
>
> I find that manually nested Tables are faster (factor 2 in my example)
> compared to the builtin nesting. I probably do a stupid thinko. Could
> you please have a look?
>
> In[52]:== imax == jmax == 5000;
>
> In[53]:== (tabletable == Table[Table[i*j, {i, imax}], {j, jmax}];) //
>   Timing // First
>
> Out[53]== 1.84
>
> In[54]:== (table == Table[i*j, {i, imax}, {j, jmax}];) // Timing // First
>
> Out[54]== 14.55
>
> In[55]:== tabletable ==== table
>
> Out[55]== True
>
> Thanks,
>
> Sebastian


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