#15885: Consider deprecating MatrixSpace(...)[index]
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Reporter: mmezzarobba | Owner:
Type: task | Status: new
Priority: major | Milestone: sage-wishlist
Component: user interface | Resolution:
Keywords: getitem, matrix rings | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by mmezzarobba:
Old description:
> Expressions such as `R['x']` and `R[sqrt(2)]` are frequently used in Sage
> to denote various kinds of ring extensions. But `R[n]` could also refer
> to the `n`-th element of `R`. This second meaning is implemented in the
> case of matrix rings, and does not look very useful in this case, or in
> fact for parents in general except for very special cases. Furthermore,
> having `__getitem__` do two unrelated things depending on its argument is
> confusing, and will get even more so if some parents start supporting
> both, say, `R[I]` and `R[42]`. So we should consider deprecating
> `R[index]` and providing a method such as `unrank()` instead.
>
> See also http://trac.sagemath.org/ticket/8389#comment:13
New description:
Expressions such as `R['x']` and `R[sqrt(2)]` are frequently used in Sage
to denote various kinds of ring extensions. But `R[n]` could also refer to
the `n`-th element of `R`. This second meaning is implemented in the case
of matrix rings, and does not look very useful in this case, or in fact
for parents in general except for very special cases. Furthermore, having
`__getitem__` do two unrelated things depending on its argument is
confusing, and will get even more so if some parents start supporting
both, say, `R[I]` and `R[42]`. So we should consider deprecating
`R[index]` and providing a method such as `unrank()` instead.
See also http://trac.sagemath.org/ticket/8389#comment:13, #12955.
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Ticket URL: <http://trac.sagemath.org/ticket/15885#comment:1>
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