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I am getting error "Index in position 2 exceeds array bounds (must not exceed 6)"

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SAKSHAM SHRIVASTAVA
评论： Torsten 2023-7-2
function [u,s,v,x,sigma]=pcarep(xi,nf)
% function [u,s,v,x,sigma]=pcarep(xi,nf)
% PCA reproduction of the original data matrix x dor nf components
% u,s,v and x as in svd matlab function [u,s,v]=svd(x)
% xi is the original input data matrix (with noise)
% x is the pca reproduced data matrix (filtered no noise)
% nf is the number of components to be included in the reproduction
t0=cputime;
[u,s,v]=svd(xi,0);
u=u(:,1:nf);
s=s(1:nf,1:nf);
v=v(:,1:nf);
x=u*s*v';
res=xi-x;
sst1=sum(sum(res.*res));
sst2=sum(sum(xi.*xi));
sigma=(sqrt(sst1/sst2))*100;
disp(['PCA CPU time: ',num2str(cputime-t0)]);
disp(['Number of conmponents: ',num2str(nf)]);
disp(['percent of lack of fit (PCA lof): ',num2str(sigma)]);
The above code is for Principal component analysis. I am running this code for my matrix named "HPLC_D4" which I am attaching here. But I m getting an error:
Index in position 2 exceeds array bounds (must not exceed 6).
Error in pcarep (line 12)
u=u(:,1:nf);
can anyone help me to get out of this problem?

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回答（1 个）

Torsten
Torsten 2023-7-2
You should try
[u,s,v]=svd(xi);
instead of
[u,s,v]=svd(xi,0);

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