#10541: Conversions of vectors to matrices
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Reporter: rbeezer | Owner: jason, was
Type: enhancement | Status: needs_review
Priority: minor | Milestone: sage-4.6.2
Component: linear algebra | Keywords:
Author: Rob Beezer | Upstream: N/A
Reviewer: Volker Braun, Marco Streng | Merged:
Work_issues: |
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Comment(by rbeezer):
Replying to [comment:10 mstreng]:
> > All changes look good,
>
> and all tests pass, so I would give it a positive review, except that I
just uploaded a patch here myself and
>
> > I'm not so sure about deprecating {{{transpose}}} for vectors. Did you
ask on the mailing lists if people object?
Hi Marco,
Thanks for attention to this - I was going to get back to it later
tonight.
In Sage, a vector does not have an orientation, just an implicit
assumption that it should be treated like a row of a matrix if you
''have'' to make a decision. I am trying to make the linear algebra code
much easier for beginners to use, and then integrating all that into my
open-source introductory textbook. You can see progress so far at:
http://wiki.sagemath.org/devel/LatexToWorksheet
So I feel strongly that just having a "vector transpose" is a source of
confusion, and instead having row() and a column() methods will make it
much more clear what is happening - and column() is a drop-in replacement.
This came up at:
http://groups.google.com/group/sage-
devel/browse_thread/thread/623226316555c28e/
You will see from the deprecation patch that `.transpose()` was hardly
ever used anywhere.
I do not think the doctest in question is incorrect. It wasn't failing
was it? Patch implements `.row()` which converts a vector to a 1 x n
matrix. So an empty vector should become a 1 x 0 matrix as a row. Maybe
you would like a similar test for `.column()`? And maybe that would be
better than the one that is there. Maybe having both would be the best
solution.
Rob
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10541#comment:11>
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