wehub-resource-sync
21 lines
453 B
Matlab
Executable File
21 lines
453 B
Matlab
Executable File
function K = knGauss(X, Y, s)
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% Gaussian (RBF) kernel K = exp(-|x-y|/(2s));
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% Input:
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% X: d x nx data matrix
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% Y: d x ny data matrix
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% s: sigma of gaussian
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% Ouput:
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% K: nx x ny kernel matrix
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% Written by Mo Chen (sth4nth@gmail.com).
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if nargin < 3
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s = 1;
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end
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if nargin < 2 || isempty(Y)
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K = ones(1,size(X,2)); % norm in kernel space
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else
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D = bsxfun(@plus,dot(X,X,1)',dot(Y,Y,1))-2*(X'*Y);
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K = exp(D/(-2*s^2));
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end
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