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Re: SortBy + Sort Strings with apo.marks + CharacterCode

  • To: mathgroup at smc.vnet.net
  • Subject: [mg118257] Re: SortBy + Sort Strings with apo.marks + CharacterCode
  • From: DrMajorBob <btreat1 at austin.rr.com>
  • Date: Mon, 18 Apr 2011 06:50:02 -0400 (EDT)

#1>#2& makes no sense for Strings, because one string is not greater (or 
less) than another.

How is "abcccdde ..." a sorting rule?

"b- d-(d) h- characters ?" is just incomprehensible.

Bobby

On Sun, 17 Apr 2011 18:15:15 -0500, Dr Andy D Kucar P2EE4 www.radio4u.com 
<andy at radio4u.com> wrote:

> Dear Mathgroup,
>
> Following on the original SortBy post and responses,
> I would like to expand with the following (Ver.4) funs
>
> In[17]
> Sort[{"January", "February", "March", "April", "May", "June", "July", 
> "August", "September", "October", "November",
> "December", "English"}]
> Sort[{"January", "February", "March", "April", "May", "June", "July", 
> "August", "September", "October", "November",
> "December", "English"}, #1 > #2 & ]
> ToCharacterCode[{"A2Z a2z =C5  Cc?? Cc =D0 =A6=A8 \!\(Z\&?\)\!\(z\&?\)"}]
>
> Out[17]
> {"April", "August", "December", "English", "February", "January", 
> "July", "June", "March", "May", "November", "October",
> "September"}
> this is OK
>
> Out[18]
> {"January", "February", "March", "April", "May", "June", "July", 
> "August", "September", "October", "November",
> "December", "English"}
> this is NOT ok; #1>#2 & has been ignored; the input has NOT been 
> evaluated, i.e. sorted;
> why?
> How to Sort these String things?
>
> Out[19]
> {{65, 50, 90, 32, 97, 50, 122, 32, 197, 32, 268, 269, 32, 262, 263, 32, 
> 208, 32, 352, 353, 32, 63425, 63433, 90, 63431,
> 780, 63424, 63425, 63433, 122, 63431, 780, 63424}}
> this ToCharacterCode conversion is OK;
> however, I have been using a text with some international characters, 
> which require sorting rules different from the
> rule presented in Mathematica;
>
> For example, one would like to sort a particular String according to the 
> following sorting rule: abcccdde ...
>
> One of (perhaps easiest) sorting possibilities would be, having been 
> able to define a sorting rule,
> or redefine the CharacterCode and give it a real (rational) number,
> such as c (change in a program its CharacterCode from 269 to 99.1, or 
> 99+269/1000, a CharacterCode number between c and
> d), etc.
>
> particularly problematic have been characters created via (Ctrl+& Esc hc 
> Esc) construction
>
> how to create b- d-(d) h- characters ?
>
> thank you, sincerely andy
>
> -----Original Message-----
> From: graser
> Sent: Friday, April 15, 2011 02:57
> To: mathgroup at smc.vnet.net
> Subject: [mg118247] SortBy
>
> Dear Mathematica group,
>
> I have a simple question for you.
>
> Let's say there is a list like
>
> KS = {{300, 48, 2}, {500, 23, 5}, {120, 55, 7}, {40, 32, 1}};
>
> I want to sort it by second element.
>
> I can use
>
> Sort[KS, #2[[2]] > #1[[2]] &]
>
> It gives out like
>
> {{500, 23, 5}, {40, 32, 1}, {300, 48, 2}, {120, 55, 7}}
>
> But if I want to use SortBy, how to do that?
>
> SortBy[KS, ??]
>
> Thanks!
>
>
>


--
DrMajorBob at yahoo.com


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