segmentation fault

[ThomasBreuer]

When trying to form Singular polynomials with rational coefficients,
I noticed that the following input causes a segmentation fault in Julia 0.6.2.

using Singular
R, vars = Singular.PolynomialRing( Singular.QQ, [ "x" ] )
x = vars[1]
divexact( x, 2 )

[wbhart]

I've included Hans in CC in case he knows what we are doing wrong. This problem also happens in Julia 0.6.1. I don't think it is Julia related. It seems to fail only if dividing by a monomial, which is not a distinction we make in Singular.jl itself. The Singular.jl code in question when doing divexact(x, x), for example, is line 327ff of poly/poly.jl [1]. This in turn calls libSingular/p_Divide, which is line 156ff of libsingular/rings.jl [2]. Bill. [1] https://github.com/wbhart/Singular.jl/blob/master/src/poly/poly.jl [2] https://github.com/wbhart/Singular.jl/blob/master/src/libsingular/rings.jl

…

On 25 April 2018 at 12:35, ThomasBreuer ***@***.***> wrote: When trying to form Singular polynomials with rational coefficients, I noticed that the following input causes a segmentation fault in Julia 0.6.2. using Singular R, vars = Singular.PolynomialRing( Singular.QQ, [ "x" ] ) x = vars[1] divexact( x, 2 ) — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#23>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAOzppWPh-y8YoIbHREU8DQaZsNBskm2ks5tsFFlgaJpZM4TjLT6> .

[hannes14]

There was reference to currRing(global variable) instead of the given ring r(parameter)
in p_Divide.
Should be fixed with Singular/Singular@49c5220