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Re: Sorting strings

  • To: mathgroup at smc.vnet.net
  • Subject: [mg123141] Re: Sorting strings
  • From: Costa Bravo <q13a27tt at aol.com>
  • Date: Thu, 24 Nov 2011 06:58:11 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <jainvm$eop$1@smc.vnet.net>

  Themis Matsoukas wrote:
> Sorting this list of strings
>
> {"a1", "a2", "a20", "a12"} // Sort
>
> I get
>
> {"a1", "a12", "a2", "a20"}
>
> but I would like the numerals to be sorted as numbers, i.e., as
>
> {"a1", "a2", "a12",  "a20"}
>
> Is this possible or do I have to rename "a1" into "a01" etc?
>

Lst = {"a1", "a2", "a20", "a12"};
Lst[[Ordering[ToExpression[StringDrop[#, 1] & /@ Lst]]]]

Out = {"a1", "a2", "a12", "a20"}

-- 
  Costa



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