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Topic: List:{1}, {2,3},{4,5,6}....
Replies: 3   Last Post: Jan 11, 2013 10:24 PM

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Ray Koopman

Posts: 3,383
Registered: 12/7/04
Re: List:{1}, {2,3},{4,5,6}....
Posted: Jan 11, 2013 10:24 PM
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On Jan 10, 6:38 pm, hknetman <hknet...@hotmail.com> wrote:
> I use the command
> list = Table[i + 1, {n, 1, 5}, {i, n (n - 1)/2, n (n - 1)/2 + n - 1}]
> to get the following result:
> {{1}, {2, 3}, {4, 5, 6}, {7, 8, 9, 10}, {11, 12, 13, 14, 15}}
>
> Is there any better method?
>
> Thanks a lot.


k = 0; Table[++k,{i,m},{j,i}]

is both clearer and shorter than both my previous suggestions.




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