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Re: sorting problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg130656] Re: sorting problem
  • From: Sid <pcoords29 at gmail.com>
  • Date: Tue, 30 Apr 2013 04:18:24 -0400 (EDT)
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On Apr 28, 8:57 am, S <dsalma... at gmail.com> wrote:
> Hello
>
> I need to sort a list in increasing magnitude. If two elements in the list are the same, the element which appears EARLIER in the list should appear first. Finally, I need the indices of the sorted list according to the above two rules.
>
> e.g. for input
> distances = {0, Sqrt[2], Sqrt[2], 0, 0, Sqrt[2], 2, Sqrt[2]}
> I need the answer to be
> k={1,4,5,2,3,6,8,7}
>
> I tried the following commands:

Hi,

How about
                   Ordering@N@distances

 HTH

Cheers
  Sid




> distances = {0, Sqrt[2], Sqrt[2], 0, 0, Sqrt[2], 2, Sqrt[2]}
> Sorteddistances = Sort[distances, Less]
> k = Ordering[distances]
>
> I get output k={1, 4, 5, 7, 2, 3, 6, 8}.
>
> However, I want the output k={1,4,5,2,3,6,8,7}
>
> Can someone please suggest how to do this.
>
> Thanks
>
> S




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