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MathGroup Archive 2007

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Re: fastest way to add up a billion numbers

  • To: mathgroup at smc.vnet.net
  • Subject: [mg73923] Re: [mg73880] fastest way to add up a billion numbers
  • From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
  • Date: Sat, 3 Mar 2007 01:03:40 -0500 (EST)
  • References: <200703021141.GAA04040@smc.vnet.net>

On 2 Mar 2007, at 12:41, Raj wrote:

> hi!
>
> Could somebody tell me what would be the fastest way to add up a
> billion numbers(from 1 to 10^9 i.e the first billion numbers) in
> Mathematica?
>
> Ofcourse the answer is n(n+1)/2, but is there any other way in
> Mathematica other than the following one:
>
> Total@@Range[10^9]
>
> Thanks,
>
> Raj
>
>


Sum[i,{i,1,10^9}]//Timing

{0.122547 Second,500000000500000000}

or much faster

In[3]:=
Timing[NSum[i, {i, 1, 10^9}]]

Out[3]=
{0.0021539999999999893*Second, 5.000000005*^17}

ANdrzej Kozlowski


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