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

*To*: mathgroup at smc.vnet.net*Subject*: [mg113833] Re: Sort a List, in a List of Lists of Lists*From*: Mauricio Esteban Cuak <cuak2000 at gmail.com>*Date*: Sun, 14 Nov 2010 06:51:11 -0500 (EST)

Depending on the different structure of list you might face, this might prove to be too ad-hoc, but you can have it while waiting for the good answers listthing = {{{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}}}; Dimensions[%] {6, 3, 2} Map[Sort[#] &, listthing, Dimensions[listthing][[3]]] This should work for other types of lists: Map[Sort[#] &, listthing, Min[Dimensions[listthing]] ] It is by no means a general solution of course. Best, me 2010/11/13 <leigh.pascoe at inserm.fr> > 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 >