#4983: replace subdivisions attribute for matrices with a function
----------------------------+-----------------------------------------------
Reporter: was | Owner: was
Type: defect | Status: new
Priority: major | Milestone: sage-3.3
Component: linear algebra | Keywords:
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I do not like this:
{{{
sage: sage: a = matrix(ZZ,4,[1, 0, 0, 0, 0, 1, 0, 0, 1, -1, 1, 0, 1, -1,
1, 2])
sage: sage: b=a.jordan_form()
sage: b.subdivisions
([0, 1, 3, 4], [0, 1, 3, 4])
sage: b.subdivisions = 10
sage: b.subdivisions
10
}}}
Notice that you can make the subdivisions nonsense because it can be
changed.
Also, of course,
{{{
sage: b.subdivisions?
... The Integer class represents arbitrary precision
integers. It derives from the Element class, so
[other useless stuff]
}}}
I don't like that at all either. I wish that subdivisions were a method
with a proper docstring, doctests, etc., and that variable were hidden.
Then one would do:
{{{
sage: b.subdivisions?
useful stuff (and also it would be in the reference manual)
and
sage: b.subdivisions()
([0, 1, 3, 4], [0, 1, 3, 4])
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4983>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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