www.gusucode.com > K聚类分析源码程序 > K聚类分析源码程序/code/similaritymat.m
function S = similaritymat(idx, samples, n) %SIMILARITYMAT Similarity matrix. % S = SIMILARITYMAT(IDX, SAMPLES, N) returns the N-by-N similarity matrix % associated with the similarity of elements in the Ns-by-1 vector, IDX. % The similarity value (0 or 1) is stored in the matrix S at the indices % associated with the Ns-by-1 vector, SAMPLES % % Copyright (2009) Sandia Corporation. Under the terms of Contract % DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains % certain rights in this software. S = zeros(n,n); for i = 1:size(samples,1) S(samples(i),samples(i)) = 1; for j = (i+1):size(samples,1) if idx(i) == idx(j) S(samples(i),samples(j)) = 1; S(samples(j),samples(i)) = 1; end end end