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Re: Principle component analysis

From: Oguz Yarimtepe
Subject: Re: Principle component analysis
Date: Thu, 16 Apr 2009 18:36:16 +0300

On Thu, 2009-04-16 at 09:24 -0600, E. Joshua Rigler wrote:
> My guess is that the graphic you linked to is a plot of the first
> column of the second output argument to princomp.m (i.e., the
> "transformed data").  Either call princomp.m with a second output
> argument, or multiply the demeaned input matrix by the principal
> component matrix.  (e.g.,
> >> pc = princomp(obs_matrix);
> >> xform_matrix = center(obs_matrix)*pc;
> This is exactly what princomp.m does to get the transformed data.

I downloaded the princomp.m from svn and here is what i got:

test princomp.m
  ***** test
 m(:,1) = m(:,1)*sign(pc(1,1));
 m(:,2) = m(:,2)*sign(pc(1,2));
!!!!! test failed
error: `zscore' undefined near line 20 column 29

I am using the octave3.0 from the Ubuntu repo. Should i checkout from
svn and install it?

Oguz Yarimtepe

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