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MathGroup Archive 2007

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Re: Why Sort[{"AX", "!D", "EX"}] -> {"AX", "!D", "EX"} ?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg76150] Re: Why Sort[{"AX", "!D", "EX"}] -> {"AX", "!D", "EX"} ?
  • From: Philipp <Philipp.M.O at gmail.com>
  • Date: Thu, 17 May 2007 05:48:24 -0400 (EDT)
  • References: <f26nv5$4cl$1@smc.vnet.net><f2951r$mu8$1@smc.vnet.net>

Jens,

Actually you can set "your" own order. If you're happy, say,  with
ASCII 0-127 order, the comparison function for 2 letter strings could
be:

In[]:=   Sort[{"AX", "!D", "EX"},
  (ToCharacterCode[#1]+1).{128, 1} < (ToCharacterCode[#2]+1).{128, 1}
&]
Out[]=   {"!D", "AX", "EX"}

This workaround is pretty slow, and, of course, it does not explain
the weirdness of Mathematica 5.2 canonical order as demonstrated in my
original post.

Cheers,
Philipp.


On May 14, 4:02 pm, Jens-Peer Kuska <k... at informatik.uni-leipzig.de>
wrote:
> Hi,
>
> and set the comparison test as *you* interpret/understand
> the order does not help
>
> Regards
>    Jens
>
>
>
> Philipp wrote:
> > Would anybody explain to me the Mathematica (5.2) canonical order.
> > Specifically, why
>
> > In[]:=   Sort[{"AX", "!D", "EX"}]
> > Out[]=   {"AX", "!D", "EX"}
>
> > while,
>
> > In[]:=   Sort[{"A", "!", "E"}]
> > Out[]=   {"!", "A", "E"}
>
> > Is this a bug???
>
> > Cheers,
>
> > Philipp.- Hide quoted text -
>
> - Show quoted text -




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