You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: spikesort.m
    path of file: ./repos/bspm/thirdparty/spm12/external/fieldtrip/private
    
    the code of the file until where you have to start completion: function [numA, numB, indA, indB] = spikesort(numA, numB, varargin)

% SPIKESORT uses a variation on the cocktail sort algorithm in combination
% with a city block distance to achieve N-D trial pairing between spike
% counts. The sorting is not guaranteed to result in the optimal pairing. A
% linear pre-sorting algorithm is used to create good initial starting
% positions.
%
% The goal of this function is to achieve optimal trial-pairing prior to
% stratifying the spike numbers in two datasets by random removal of some
% spikes in the trial and channel with the largest numnber of spikes.
% Pre-sorting based on the city-block distance between the spike count
% ensures that as few spikes as possible are lost.
%
% Use as
%   [srtA, srtB, indA, indB] = spikesort(numA, numB, ...)
%
% Optional arguments should be specified as key-value pairs and can include
%   'presort'  number representing the column, 'rowwise' or 'global'
%
% Example
%   numA = reshape(randperm(100*3), 100, 3);
%   numB = reshape(randperm(100*3), 100, 3);
%   [srtA, srtB, indA, indB] = spikesort(numA, numB);
%   % check that the order is correct, the following should be zero
%   numA(indA,:) - srtA
%   numB(indB,:) - srtB
%
% See also COCKTAILSORT

% Copyright (C) 2007, Robert Oostenveld
%
% This file is part of FieldTrip, see http://www.fieldtriptoolbox.org
% for the documentation and details.
%
%    FieldTrip is free software: you can redistribute it and/or modify

    
function [numA, numB, indA, indB] = spikesort(numA, numB, varargin)

% SPIKESORT uses a variation on the cocktail sort algorithm in combination
% with a city block distance to achieve N-D trial pairing between spike
% counts. The sorting is not guaranteed to result in the optimal pairing. A
% linear pre-sorting algorithm is used to create good initial starting
% positions.
%
% The goal of this function is to achieve optimal trial-pairing prior to
% stratifying the spike numbers in two datasets by random removal of some
% spikes in the trial and channel with the largest numnber of spikes.
% Pre-sorting based on the city-block distance between the spike count
% ensures that as few spikes as possible are lost.
%
% Use as
%   [srtA, srtB, indA, indB] = spikesort(numA, numB, ...)
%
% Optional arguments should be specified as key-value pairs and can include
%   'presort'  number representing the column, 'rowwise' or 'global'
%
% Example
%   numA = reshape(randperm(100*3), 100, 3);
%   numB = reshape(randperm(100*3), 100, 3);
%   [srtA, srtB, indA, indB] = spikesort(numA, numB);
%   % check that the order is correct, the following should be zero
%   numA(indA,:) - srtA
%   numB(indB,:) - srtB
%
% See also COCKTAILSORT

% Copyright (C) 2007, Robert Oostenveld
%
% This file is part of FieldTrip, see http://www.fieldtriptoolbox.org
% for the documentation and details.
%
%    FieldTrip is free software: you can redistribute it and/or modify
%    it under the terms of the GNU General Public License as published by
%    the Free Software Foundation, either version 3 of the License, or
%    (at your option) any later version.
%
%    FieldTrip is distributed in the hope that it will be useful,
%    but WITHOUT ANY WARRANTY; without even the implied warranty of
%    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
%    GNU General Public License for more details.
%
%    You should have received a copy of the GNU General Public License
%    along with FieldTrip. If not, see <http://www.gnu.org/licenses/>.
%
% $Id$

% this can be used for printing detailled user feedback
fb = false;

% get the options
presort = ft_getopt(varargin, 'presort');

if any(size(numA)~=size(numB))
  ft_error('input dimensions should be the same');
end