#20287: Implement the Moore–Penrose matrix pseudoinverse
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Reporter: jdemeyer | Owner:
Type: enhancement | Status: positive_review
Priority: major | Milestone: sage-7.2
Component: linear algebra | Resolution:
Keywords: | Merged in:
Authors: Jeroen Demeyer | Reviewers: Frédéric Chapoton
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jdemeyer/pseudoinverse | 3a3f5521eb8ced6c64a329918ac3544633286e89
Dependencies: #20286 | Stopgaps:
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Comment (by jdemeyer):
Replying to [comment:15 mjo]:
> Then why offer the choice?
General principle: because I see no reason to ''not'' offer the choice. If
a choice is available, why not allow the user to override that choice? Of
course, offer a good default.
More specifically: it might be hard to guess between `exact` and
`exactconj`.
> I ask because, if you remove the `algorithm` parameter, it looks like a
matrix superclass method is trying to figure out what to do by a "what
subclass am I" heuristic.
I disagree completely. This has nothing to do with the `type()` of the
matrix, but with the mathematical properties of the parent.
With your proposal, `pseudoinverse()` would no longer work for matrices
over `RR` or `CC` or for sparse matrices.
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Ticket URL: <http://trac.sagemath.org/ticket/20287#comment:16>
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