id,summary,reporter,owner,description,type,status,priority,milestone,component,resolution,keywords,cc,merged,author,reviewer,upstream,work_issues,branch,commit,dependencies,stopgaps
10795,Fix and upgrade double dense matrix QR decomposition,rbeezer,jason was,"The Q matrix of a QR decomposition should be unitary, hence invertible. For zero-column trivial cases, this is broken.
{{{
sage: A = zero_matrix(CDF, 5, 0)
sage: Q, R = A.QR()
sage: Q
[0 0 0 0 0]
[0 0 0 0 0]
[0 0 0 0 0]
[0 0 0 0 0]
[0 0 0 0 0]
}}}
Besides a bugfix this patch will upgrade the documentation to make it clear how this routine works over the complex numbers. In particular, `SciPy` routines are using a Hermitian inner product - documentation upgrade will reflect that.
'''Apply''':
1. [attachment:trac_10795-QR-decomposition-double-dense-v2.patch]
1. [attachment:trac_10795-QR-decomposition-formatting.patch]",defect,closed,minor,sage-5.2,linear algebra,fixed,sd40.5,jason ddrake,sage-5.2.beta1,Rob Beezer,"Martin Raum, Dan Drake",N/A,,,,,