Opened 10 years ago
Last modified 3 years ago
#5225 new defect
unhandled case in converting to polynomial ring
Reported by: | cwitty | Owned by: | malb |
---|---|---|---|
Priority: | major | Milestone: | sage-6.4 |
Component: | commutative algebra | Keywords: | |
Cc: | Merged in: | ||
Authors: | Reviewers: | ||
Report Upstream: | N/A | Work issues: | |
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description
Normally, Sage tries to allow explicit conversions between arbitrary polynomial rings, if they share the same variable names.
Here's a case where that doesn't work:
R.<a,b,c,d,e,f,x,y,z,t,s,r>=PolynomialRing(QQ,12,order='lex') I=R.ideal(a^2+d^2-x,a*b+d*e-y,a*c+d*f-z,b^2+e^2-t,b*c+e*f-s,c*c+f*f-r) j=I.groebner_basis() R1.<x,y,z,t,s,r>=QQ[] R2=FractionField(R1) R3.<a,b,c,d,e,f>=R1.fraction_field()[] R3(j[0])
For now, the workaround is:
sage_eval(str(j[0]), locals=locals())
but IMHO the original code should work.
Change History (5)
comment:1 Changed 6 years ago by
- Milestone changed from sage-5.11 to sage-5.12
comment:2 Changed 5 years ago by
- Milestone changed from sage-6.1 to sage-6.2
comment:3 Changed 5 years ago by
- Milestone changed from sage-6.2 to sage-6.3
comment:4 Changed 5 years ago by
- Milestone changed from sage-6.3 to sage-6.4
comment:5 Changed 3 years ago by
- Report Upstream set to N/A
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A smaller example (minimal I hope ;-)):