Re: fastest way to add up a billion numbers
- To: mathgroup at smc.vnet.net
- Subject: [mg73930] Re: [mg73880] fastest way to add up a billion numbers
- From: Sseziwa Mukasa <mukasa at jeol.com>
- Date: Sat, 3 Mar 2007 01:07:31 -0500 (EST)
- References: <200703021141.GAA04040@smc.vnet.net>
On Mar 2, 2007, at 6:41 AM, 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]
That's not a good way to approach the problem because Range will
create a list of a billion elements which is expensive, or more
likely going to run out of memory.
Use Sum
Sum[i,{i,10^9}]
Regards,
Ssezi
- References:
- fastest way to add up a billion numbers
- From: "Raj" <rajanikanth@gmail.com>
- fastest way to add up a billion numbers