[Scipy-tickets] [SciPy] #1473: QR Decomposition with Pivoting

SciPy Trac scipy-tickets@scipy....
Thu Jul 7 17:03:51 CDT 2011


#1473: QR Decomposition with Pivoting
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 Reporter:  collinstocks  |       Owner:  somebody   
     Type:  enhancement   |      Status:  new        
 Priority:  normal        |   Milestone:  Unscheduled
Component:  scipy.linalg  |     Version:  0.7.0      
 Keywords:                |  
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 The qr function in the linear algebra library is lacking some of the
 functionality that exists in the matlab function of the same name. While
 the purpose of scipy is certainly not duplicate the functionality of
 matlab, qr decomposition with pivoting is a rather important feature, as
 it can be used, for example, to estimate the rank of a matrix.

 I am not familiar enough with the scipy code to create a new lapack
 wrapper, but I have implemented the functionality described above by using
 cvxopt.lapack. Clearly, a production version should wrap lapack.geqp3
 properly.

 Unfortunately, the reference implementation I made is based off linalg.qr
 from scipy version 0.7.1. I can probably do the same for the current
 version without too much difficulty.

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Ticket URL: <http://projects.scipy.org/scipy/ticket/1473>
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