?? normit.m
字號:
function [Y,D]=normit(X)
%NORMIT normalize
%
%[Y,D]=normit(X);
%Normalizes X, such that X = Y *D
%It also applies that X' = D'*Y'
%Always give X column wise
% Copyright
% Claus A. Andersson 1996-
% Chemometrics Group, Food Technology
% Department of Food and Dairy Science
% Royal Veterinary and Agricultutal University
% Rolighedsvej 30, DK-1958 Frederiksberg, Denmark
% E-mail: claus@andersson.dk
[a b]=size(X);
Y=zeros(a,b);
SS=sqrt(sum(X.^2));
for i=1:b,
Y(:,i)=X(:,i)./SS(i);
end;
if nargout==2,
D=(Y'*Y)\(Y'*X);
end;
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