#13643: default norm for RDF/CDF matrices is inconsistent with other types of
matrices
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Reporter: jason | Owner: jason, was
Type: defect | Status: new
Priority: major | Milestone: sage-5.5
Component: linear algebra | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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Currently, the default norm for matrices is the induced 2-norm, unless the
matrix is an RDF or CDF matrix, in which case the default norm is the
Frobenius norm. Needless to say, this is very confusing:
{{{
sage: version()
'Sage Version 5.4.rc1, Release Date: 2012-10-05'
sage: a=matrix(QQ, 3, range(9))
sage: a.norm()
14.2267073908
sage: a.norm(2)
14.2267073908
sage: b=a.change_ring(RDF)
sage: b.norm()
14.2828568571
sage: b.norm('frob')
14.2828568571
}}}
I propose we change the default norm for RDF/CDF matrices to the induced
2-norm.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13643>
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