[Senseclusters-users] Updated svdpackout.pl

[ted p. <tpederse@d.umn.edu>]

Hi Ted and other SenseClusters folks,

I've updated the svdpackout.pl file so that I can extract the  
component U, S, and V' (V-transpose) matrices rather than only being  
able to extract the reconstructed matrix or the rows-only.

I've attached my version to this message.  Feel free to use it as you  
see fit.

Here's a brief changelog:
* Added feature to output the component U, S, and V' matrices.
* Added a new command-line option "--output" with three options:
	reconstruct - reconstructs the rank-k matrix (default)
	rowonly - same as --rowonly
         components - output U, S, V' matrices to U.txt, S.txt, VT.txt
* Added a new command-line option "--negatives":
         Allows negative values; otherwise all negative values are set
         to 0 (except in component output).
* New options maintain backward compatibility
* Updated the documentation.
* Passes all tests (testA1-A4,B1-B2)

Hope this helps you -- it helped my students!

As an aside -- and I'd be happy to post this to the main newsgroup if  
you'd rather -- what is the purpose of the "rowonly" feature?  Why do  
you multiply U by the sqrt of the S values?  Is there some  
theoretical reason to do this?

Thanks!

-Rich

--                                                                       
        
Richard Wicentowski
Assistant Professor
Computer Science Department
Swarthmore College
(610) 690-5643