#19538: Fix LaurentPolynomialRing coercion issues
-------------------------+-------------------------------------------------
Reporter: | Owner:
etn40ff | Status: needs_review
Type: | Milestone: sage-6.10
defect | Resolution:
Priority: major | Merged in:
Component: | Reviewers:
algebra | Work issues:
Keywords: | Commit:
Authors: | 76ac4339b195762106d406516400f8468de844ef
Salvatore Stella | Stopgaps:
Report Upstream: N/A |
Branch: |
u/etn40ff/19358 |
Dependencies: |
-------------------------+-------------------------------------------------
Comment (by stumpc5):
When I do the very same on {{{LaurentPolynomialRing}}}, I get into
trouble, so I don't understand what you mean by "the conversion rules are
the same for {{{PolynomialRing}}} and {{{LaurentPolynomialRing}}}", see
{{{
sage: R1 = LaurentPolynomialRing(ZZ, 'x,y')
sage: R2 = LaurentPolynomialRing(ZZ, 'x,t')
sage: R3 = LaurentPolynomialRing(ZZ, 't,x')
sage: R4 = LaurentPolynomialRing(ZZ, 'x,t,y')
sage: map(R4, R1.gens()) # rule 1
---------------------------------------------------------------------------
...
TypeError: tuple key must have same length as ngens
sage: map(R4, R3.gens()) # rule 1
---------------------------------------------------------------------------
...
TypeError: tuple key must have same length as ngens
sage: map(R1, R2.gens()) # rule 2
[x, y]
sage: map(R2, R1.gens()) # rule 2
[x, t]
sage: R1(R4('y')) # rule 3
---------------------------------------------------------------------------
...
TypeError: tuple key must have same length as ngens
sage: R1(R4('t')) # rule 4
---------------------------------------------------------------------------
...
TypeError: tuple key must have same length as ngens
}}}
Is that behaviour what you expected?
--
Ticket URL: <http://trac.sagemath.org/ticket/19538#comment:9>
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