k最邻近距离的matlab实现

function [idx,D]=knnsearch(varargin)

% Check inputs
[Q,R,K,fident] = parseinputs(varargin{:});

% Check outputs
error(nargoutchk(0,2,nargout));

% C2 = sum(C.*C,2)';
[N,M] = size(Q);
L=size(R,1);
idx = zeros(N,K);
D = idx;

if K==1
    % Loop for each query point
    for k=1:N
        d=zeros(L,1);
        for t=1:M
            d=d+(R(:,t)-Q(k,t)).^2;
        end
        if fident
            d(k)=inf;
        end
        [D(k),idx(k)]=min(d);
    end
else
    for k=1:N
        d=zeros(L,1);
        for t=1:M