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: randmio_und_signed.m
    path of file: ./repos/EEGapp/EEGapp/custom_stuff/BCT/2017_01_15_BCT
    
    the code of the file until where you have to start completion: function [R,eff] = randmio_und_signed(W, ITER)
% RANDMIO_UND_SIGNED	Random graph with preserved signed degree distribution
%
%   R       = randmio_und_signed(W,ITER);
%   [R,eff] = randmio_und_signed(W,ITER);
%
%   This function randomizes an undirected network with positively and
%   negatively signed connections, while preserving the positively and
%   negatively signed degree distribution. The function does not preserve
%   the strength distribution in weighted networks.
%
%   Input:      W,      undirected (binary/weighted) connection matrix
%               ITER,   rewiring parameter
%                       (each edge is rewired approximately ITER times)
%
%   Output:     R,      randomized network
%               eff,    number of actual rewirings carried out
%
%   Reference:  Maslov and Sneppen (2002) Science 296:910

    
function [R,eff] = randmio_und_signed(W, ITER)
% RANDMIO_UND_SIGNED	Random graph with preserved signed degree distribution
%
%   R       = randmio_und_signed(W,ITER);
%   [R,eff] = randmio_und_signed(W,ITER);
%
%   This function randomizes an undirected network with positively and
%   negatively signed connections, while preserving the positively and
%   negatively signed degree distribution. The function does not preserve
%   the strength distribution in weighted networks.
%
%   Input:      W,      undirected (binary/weighted) connection matrix
%               ITER,   rewiring parameter
%                       (each edge is rewired approximately ITER times)
%
%   Output:     R,      randomized network
%               eff,    number of actual rewirings carried out
%
%   Reference:  Maslov and Sneppen (2002) Science 296:910
%
%
%   2011-2015
%   Dani Bassett, UCSB
%   Olaf Sporns,  Indiana U
%   Mika Rubinov, U Cambridge

%   Modification History:
%   Mar 2011: Original (Dani Bassett, based on randmio_und.m)
%   Mar 2012: Limit number of rewiring attempts,
%             count number of successful rewirings (Olaf Sporns)
%   Dec 2015: Rewritten the core of the rewiring algorithm to allow
%             unbiased exploration of all network configurations. The new
%             algorithm allows positive-positive/negative-negative
%             rewirings, in addition to the previous positive-positive/0-0
%             and negative-negative/0-0 rewirings (Mika Rubinov). 

if nargin('randperm')==1
    warning('This function requires a recent (>2011) version of MATLAB.')
end