?? l2_distance.m
字號:
function d = l2_distance(X,Y)
% d = l2_distance(X)
% Compute pairwise l2 distances between column vectors in X
%
% Warning -- this implementation suffers from cancellation error.
%
% Author: David Ross, June 27, 2003.
%
if nargin == 1
[D N] = size(X);
lengths = sum(X.^2,1);
d = repmat(lengths,[N 1]) + repmat(lengths',[1 N]);
d = d - 2* X'*X;
elseif nargin == 2
XX = sum(X.^2,1);
YY = sum(Y.^2,1);
d = repmat(XX', [1 size(Y,2)]) + repmat(YY, [size(X,2) 1]);
d = d - 2*X'*Y;
else
error('must have 1 or 2 arguments');
end
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