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Re: Sort a List, in a List of Lists of Lists

  • To: mathgroup at smc.vnet.net
  • Subject: [mg113806] Re: Sort a List, in a List of Lists of Lists
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Sun, 14 Nov 2010 06:07:09 -0500 (EST)

Map[Sort, data, {2}]


Bob Hanlon

---- leigh.pascoe at inserm.fr wrote: 

=============
Dear Mathgroup,

I have a lsit of Lists of Lists:

{{{1,2},{2,1},{1,1}},{{1,1},{1,1},{1,2}},{{2,1},{2,2},{1,2}},{{2,2},{1,2},{2,2}},{{1,1},{2,1},{1,2}},{{1,2},{2,2},{2,2}}}

I would like to sort the elements in the lowest level of brackets to give

{{{1, 2}, {1, 2}, {1, 1}}, {{1, 1}, {1, 1}, {1, 2}}, {{1, 2}, {2,
    2}, {1, 2}}, {{2, 2}, {1, 2}, {2, 2}}, {{1, 1}, {1, 2}, {1,
    2}}, {{1, 2}, {2, 2}, {2, 2}}}

i.e retaining the same structure with the paired elements in the 
original order. I can't seem to get the syntax right to do this apart 
from the obvious

{{Sort[{1, 2}], Sort[{2, 1}], Sort[{1, 1}]}, {Sort[{1, 1}],
   Sort[{1, 1}], Sort[{1, 2}]}, {Sort[{2, 1}], Sort[{2, 2}],
   Sort[{1, 2}]}, {Sort[{2, 2}], Sort[{1, 2}],
   Sort[{2, 2}]}, {Sort[{1, 1}], Sort[{2, 1}],
   Sort[{1, 2}]}, {Sort[{1, 2}], Sort[{2, 2}], Sort[{2, 2}]}}

I must have a blind spot for the correct command. Can someone please 
help me with what should be a straightforward sort. As I want to carry 
this out on several hundred thousand pairs I need a more efficient 
command. Thanks in advance.

LP

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