divexact for decorated polynomials #223
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On Thu, Jan 07, 2021 at 04:39:16AM -0800, delphinepol wrote:
Fixed - i.e Tommy fixed it.
You'll need to update Oscar...at your own peril...
… When trying to take a fraction with decorated polynomials, it seems to run into a loop because of divexact:
```
julia> S, (x,y,z) = PolynomialRing(QQ, ["x", "y", "z"])
(Multivariate Polynomial Ring in x, y, z over Rational Field, fmpq_mpoly[x, y, z])
julia> T = grade(S)
Multivariate Polynomial Ring in x, y, z over Rational Field filtrated by
x -> [1]
y -> [1]
z -> [1]
julia> divexact(T(x), T(1))
ERROR: StackOverflowError:
Stacktrace:
[1] divexact(::Oscar.MPolyElem_dec{fmpq}, ::Oscar.MPolyElem_dec{fmpq}) at /home/pol/.julia/packages/AbstractAlgebra/W7COB/src/Rings.jl:84
[2] divexact(::Oscar.MPolyElem_dec{fmpq}, ::Oscar.MPolyElem_dec{fmpq}) at /home/pol/.julia/packages/AbstractAlgebra/W7COB/src/Rings.jl:86 (repeats 79983 times)
julia> T(x)//T(y)
ERROR: StackOverflowError:
Stacktrace:
[1] divexact(::Oscar.MPolyElem_dec{fmpq}, ::Oscar.MPolyElem_dec{fmpq}) at /home/pol/.julia/packages/AbstractAlgebra/W7COB/src/Rings.jl:84
[2] divexact(::Oscar.MPolyElem_dec{fmpq}, ::Oscar.MPolyElem_dec{fmpq}) at /home/pol/.julia/packages/AbstractAlgebra/W7COB/src/Rings.jl:86 (repeats 79983 times)
```
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#223
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On Thu, Jan 07, 2021 at 04:39:16AM -0800, delphinepol wrote:
Sorry - fixed in Oscar#master only
… When trying to take a fraction with decorated polynomials, it seems to run into a loop because of divexact:
```
julia> S, (x,y,z) = PolynomialRing(QQ, ["x", "y", "z"])
(Multivariate Polynomial Ring in x, y, z over Rational Field, fmpq_mpoly[x, y, z])
julia> T = grade(S)
Multivariate Polynomial Ring in x, y, z over Rational Field filtrated by
x -> [1]
y -> [1]
z -> [1]
julia> divexact(T(x), T(1))
ERROR: StackOverflowError:
Stacktrace:
[1] divexact(::Oscar.MPolyElem_dec{fmpq}, ::Oscar.MPolyElem_dec{fmpq}) at /home/pol/.julia/packages/AbstractAlgebra/W7COB/src/Rings.jl:84
[2] divexact(::Oscar.MPolyElem_dec{fmpq}, ::Oscar.MPolyElem_dec{fmpq}) at /home/pol/.julia/packages/AbstractAlgebra/W7COB/src/Rings.jl:86 (repeats 79983 times)
julia> T(x)//T(y)
ERROR: StackOverflowError:
Stacktrace:
[1] divexact(::Oscar.MPolyElem_dec{fmpq}, ::Oscar.MPolyElem_dec{fmpq}) at /home/pol/.julia/packages/AbstractAlgebra/W7COB/src/Rings.jl:84
[2] divexact(::Oscar.MPolyElem_dec{fmpq}, ::Oscar.MPolyElem_dec{fmpq}) at /home/pol/.julia/packages/AbstractAlgebra/W7COB/src/Rings.jl:86 (repeats 79983 times)
```
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When trying to take a fraction with decorated polynomials, it seems to run into a loop because of divexact:
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