wehub-resource-sync
11 lines
364 B
Matlab
Executable File
11 lines
364 B
Matlab
Executable File
function K = sd2kn(D)
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% Transform a squared distance matrix to a kernel matrix.
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% The data are assumed to be centered, i.e., H=eye(n)-ones(n)/n; K=-(H*D*H)/2.
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% Input:
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% D: n x n squared distance matrix
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% Ouput:
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% K: n x n kernel matrix
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% Written by Mo Chen (sth4nth@gmail.com).
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D = bsxfun(@minus,D,mean(D,1));
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D = bsxfun(@minus,D,mean(D,2));
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K = (D+D')/(-4); |