module_degree_zscore.m
3209cc2b0b1dmaster

module_degree_zscore.m
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			function Z=module_degree_zscore(W,Ci,flag)
			%MODULE_DEGREE_ZSCORE Within-module degree z-score
			%
			% Z=module_degree_zscore(W,Ci,flag);
			%
			% The within-module degree z-score is a within-module version of degree
			% centrality.
			%
			% Inputs: W, binary/weighted, directed/undirected connection matrix
			% Ci, community affiliation vector
			% flag, 0, undirected graph (default)
			% 1, directed graph: out-degree
			% 2, directed graph: in-degree
			% 3, directed graph: out-degree and in-degree
			%
			% Output: Z, within-module degree z-score.
			%
			% Reference: Guimera R, Amaral L. Nature (2005) 433:895-900.
			%
			%
			% Mika Rubinov, UNSW, 2008-2010

			if ~exist('flag','var')
			flag=0;
			end

			switch flag
			case 0 % no action required
			case 1 % no action required
			case 2; W=W.';
			case 3; W=W+W.';
			end

			n=length(W); %number of vertices
			Z=zeros(n,1);
			for i=1:max(Ci)
			Koi=sum(W(Ci==i,Ci==i),2);
			Z(Ci==i)=(Koi-mean(Koi))./std(Koi);
			end

			Z(isnan(Z))=0;