| 12345678910111213141516171819202122232425262728 |
- function [kden,N,K] = density_und(CIJ)
- % DENSITY_UND Density
- %
- % kden = density_und(CIJ);
- % [kden,N,K] = density_und(CIJ);
- %
- % Density is the fraction of present connections to possible connections.
- %
- % Input: CIJ, undirected (weighted/binary) connection matrix
- %
- % Output: kden, density
- % N, number of vertices
- % K, number of edges
- %
- % Notes: Assumes CIJ is undirected and has no self-connections.
- % Weight information is discarded.
- %
- %
- % Olaf Sporns, Indiana University, 2002/2007/2008
- % Modification history:
- % 2009-10: K fixed to sum over one half of CIJ [Tony Herdman, SFU]
- N = size(CIJ,1);
- K = nnz(triu(CIJ));
- kden = K/((N^2-N)/2);
|
