strengths_und_sign.m
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			function [Spos,Sneg,vpos,vneg] = strengths_und_sign(W)
			%STRENGTHS_UND_SIGN Strength and weight
			%
			% [Spos Sneg] = strengths_und_sign(W);
			% [Spos Sneg vpos vneg] = strengths_und_sign(W);
			%
			% Node strength is the sum of weights of links connected to the node.
			%
			% Inputs: W, undirected connection matrix with positive
			% and negative weights
			%
			% Output: Spos/Sneg, nodal strength of positive/negative weights
			% vpos/vneg, total positive/negative weight
			%
			%
			% 2011, Mika Rubinov, UNSW

			% Modification History:
			% Mar 2011: Original


			n = length(W); %number of nodes
			W(1:n+1:end) = 0; %clear diagonal
			Spos = sum( W.*(W>0)); %positive strengths
			Sneg = sum(-W.*(W<0)); %negative strengths

			if nargout>2
			vpos = sum(Spos); %positive weight
			vneg = sum(Sneg); %negative weight
			end

ISFCClustering/2019_03_03_BCT/strengths_und_sign.m3209cc2b0b1dmaster