dist.m

有监督自组织映射-偏最小二乘算法(A supervised self-organising map–partial least squares algorithm),可以用语多变量数据的回归分析

function z = dist(w,p)

if isstr(w)
  switch (w)
    case 'deriv',
      z = '';
    otherwise
      error('Unrecognized code.')
  end
  return
end

if nargin == 1
  p = w;
  w = w';
end

[S,R] = size(w);
[R2,Q] = size(p);
if (R ~= R2)
    error('Matrix dimensions do not match.')
end

z = zeros(S,Q);
if (Q<S)
  p = p';
  copies = zeros(1,S);
  for q=1:Q
    z(:,q) = sum((w-p(q+copies,:)).^2,2);
  end
else
  w = w';
  copies = zeros(1,Q);
  for i=1:S
    z(i,:) = sum((w(:,i+copies)-p).^2,1);
  end
end
z = sqrt(z);