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# sort_key

## (Toolbox/sort_key.m in BrainStorm 2.0 (Alpha))

### Function Synopsis

    [y,i] = sort_key(x,n)

### Help Text

    SORT_KEY - Sort with column keys
     function [y,i] = sort_key(x,n)
     function [y,i] = sort_key(x,n);
     Sort the columns of x using the key orders in n
      e.g. sort_key(x,[2 1 3]) means sort first by the second column, then ties in
      the second column are sorted in the first column, then finally the third
      column.

     If n got given, then columns sorted in column order, i.e. [1 2 3 . . .].

     y is the sorted matrix, equal to x(i,:);

### Cross-Reference Information

This function is called by

    tessellation_stats                 C:\BrainStorm_2001\Toolbox\tessellation_stats.m

### Listing of function C:\BrainStorm_2001\Toolbox\sort_key.m

    function [y,i] = sort_key(x,n)
    %SORT_KEY - Sort with column keys
    % function [y,i] = sort_key(x,n)
    % function [y,i] = sort_key(x,n);
    % Sort the columns of x using the key orders in n
    %  e.g. sort_key(x,[2 1 3]) means sort first by the second column, then ties in
    %  the second column are sorted in the first column, then finally the third
    %  column.
    %
    % If n got given, then columns sorted in column order, i.e. [1 2 3 . . .].
    %
    % y is the sorted matrix, equal to x(i,:);

    %<autobegin> ---------------------- 26-May-2004 11:34:26 -----------------------
    % --------- Automatically Generated Comments Block Using AUTO_COMMENTS ---------
    %
    % CATEGORY: Utility - Numeric
    %
    % At Check-in: $Author: Mosher $  $Revision: 6 $  $Date: 5/26/04 10:02a $
    %
    % This software is part of BrainStorm Toolbox Version 2.0 (Alpha) 24-May-2004
    %
    % Principal Investigators and Developers:
    % ** Richard M. Leahy, PhD, Signal & Image Processing Institute,
    %    University of Southern California, Los Angeles, CA
    % ** John C. Mosher, PhD, Biophysics Group,
    %    Los Alamos National Laboratory, Los Alamos, NM
    % ** Sylvain Baillet, PhD, Cognitive Neuroscience & Brain Imaging Laboratory,
    %    CNRS, Hopital de la Salpetriere, Paris, France
    %
    % See BrainStorm website at http://neuroimage.usc.edu for further information.
    %
    % Copyright (c) 2004 BrainStorm by the University of Southern California
    % This software distributed  under the terms of the GNU General Public License
    % as published by the Free Software Foundation. Further details on the GPL
    % license can be found at http://www.gnu.org/copyleft/gpl.html .
    %
    % FOR RESEARCH PURPOSES ONLY. THE SOFTWARE IS PROVIDED "AS IS," AND THE
    % UNIVERSITY OF SOUTHERN CALIFORNIA AND ITS COLLABORATORS DO NOT MAKE ANY
    % WARRANTY, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF
    % MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, NOR DO THEY ASSUME ANY
    % LIABILITY OR RESPONSIBILITY FOR THE USE OF THIS SOFTWARE.
    %<autoend> ------------------------ 26-May-2004 11:34:26 -----------------------

    if ~exist('n','var'),
       n = [1:size(x,2)];
    end

    n = n(:)'; % ensure a row vector

    % now flip its ordering
    n = n(end:-1:1);
    % initialize the indexing
    i = [1:size(x,1)]';

    for j = n,
       % sort the jth column, using the ordering of the previous recursion
       [ignore,ii] = sort(x(i,j));
       i = i(ii);
    end
    y = x(i,:);

Produced by color_mat2html, a customized BrainStorm 2.0 (Alpha) version of mat2html on Tue Nov 2 16:17:59 2004
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