[boost] First principal component

From: Johan Råde (rade_at_[hidden])
Date: 2007-03-23 11:47:16

Hej Erik,

The first singular value is:

    1.9071

The first principal component has the following values for each variable 
(PIP):

   -0.3288
   -0.3763
   -1.0907
    0.9091
   -1.5176
   -0.7170
   -1.6430
   -1.1700
   -0.2144
    1.4566
    0.2295
   -0.7296
   -1.0471

The first principal component has the following values for each sample 
(these are the ones you want to plot):

    0.8878
    0.9211
    1.1391
    0.8372
    1.3336
    0.8283
    0.7192
    0.7994
    0.9854
    1.5206
    0.7769
    0.9962
    1.3031
    0.8699
    0.6403

---------------------------------------------------------

Example: This means that according this model, for instance,
the logarithm of the relative expression value
of the 1st gene for the 1st sample should be

1.9071 * -0.3288 * 0.8878

Similarly, the logarithm of the relative expression value
of the 2nd gene for the 3rd sample should be

1.9071 * -0.3763 * 1.1391

--Johan