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Manually nested Tables faster than builtin nesting?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg113391] Manually nested Tables faster than builtin nesting?
  • From: Sebastian Schmitt <sschmitt at physi.uni-heidelberg.de>
  • Date: Wed, 27 Oct 2010 05:13:59 -0400 (EDT)

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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