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: score_wu.m
    path of file: ./repos/fieldtrip/external/bct
    
    the code of the file until where you have to start completion: function [CIJscore,sn] = score_wu(CIJ,s)
%SCORE_WU       S-score
%
%   [CIJscore,sn] = score_wu(CIJ,s);
%
%   The s-core is the largest subnetwork comprising nodes of strength at

    
function [CIJscore,sn] = score_wu(CIJ,s)
%SCORE_WU       S-score
%
%   [CIJscore,sn] = score_wu(CIJ,s);
%
%   The s-core is the largest subnetwork comprising nodes of strength at
%   least s. This function computes the s-core for a given weighted
%   undirected connection matrix. Computation is analogous to the more
%   widely used k-core, but is based on node strengths instead of node
%   degrees. 
%
%   input:          CIJ,	connection/adjacency matrix (weighted, undirected)
%                     s,    level of s-core. Note: s can take on any fractional value
%
%   output:    CIJscore,    connection matrix of the s-core.  This matrix 
%                           contains only nodes with a strength of at least s.
%                    sn,    size of s-score
%
%   Olaf Sporns, Indiana University, 2007/2008/2010/2012

while 1

    % get strengths of matrix
    [str] = strengths_und(CIJ);

    % find nodes with strength <s
    ff = find((str<s)&(str>0));
    
    % if none found -> stop
    if (isempty(ff)) break; end