[vtkusers] Vtkpcastatistics eigenvectors
dcthomp at sandia.gov
Tue Jun 15 13:53:20 EDT 2010
> I'm trying to use the Vtkpcastatistics filter for an eigenvectors
> analysis. But i'm not sure where the corresponding eigenvalues and
> eigenvectors are stored in the output of the filter. Does someone on
> the list have some experience with the filter?
There are some links to PDF reports on the various statistics engines
See the Documentation section near the bottom of the page.
The PCA statistics filter (with the Learn option turned on, the
default) takes a vtkTable containing observations and generates (on
the filter's second output) a multiblock dataset whose first block is
a vtkTable containing means and centered sums of co-moments; and whose
following blocks (assuming you have also turned on the filter's Derive
option) are tables laid out as shown here:
Specifically, http://paraview.org/Wiki/File:PCADerivedData.png shows
how the eigenvalues and eigenvectors are reported.
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