yes, indeed this is a bug. Thanks for reporting. Would you like to make the next step to solve that ? Then you should ask for an account on trac.sagemath.org and open a ticket.
Instructions are available here: http://www.sagemath.org/git-developer-guide/ Frederic Le mercredi 31 août 2016 15:38:17 UTC+2, Simon Brandhorst a écrit : > > {{{ > sage: q=FreeQuadraticModule(ZZ,2,inner_product_matrix=1) > sage: q > Ambient free quadratic module of rank 2 over the principal ideal domain > Integer Ring > Inner product matrix: > [1 0] > [0 1] > sage: q.determinant() > 1 > sage: q.discriminant() > -2 > }}} > > > This output is wrong. The discriminant should be -1. > > The following is another related bug. I guess thats where the error of the > first bug lies as well. > > > {{{ > sage: q=FreeQuadraticModule(QQ,2,inner_product_matrix=1) > sage: q.determinant() > 1 > sage: q.discriminant() > --------------------------------------------------------------------------- > RuntimeError Traceback (most recent call last) > <ipython-input-204-22cd2398c8db> in <module>() > ----> 1 q.discriminant() > > /usr/lib/sagemath/local/lib/python2.7/site-packages/sage/modules/free_quadratic_module.pyc > > in discriminant(self) > 377 else: > 378 r = (n-1)//2 > --> 379 return (-1)^r*self.gram_matrix().determinant() > 380 > 381 def gram_matrix(self): > > sage/structure/element.pyx in sage.structure.element.Element.__xor__ > (/usr/lib/sagemath//src/build/cythonized/sage/structure/element.c:8229)() > > RuntimeError: Use ** for exponentiation, not '^', which means xor > in Python, and has the wrong precedence. > }}} > > This occurred on two different machines running sage 7.0 and 7.2 on Ubuntu > 14.04.4 LTS and Fedora 24 > (both x64). > > Sorry if this is not following some conventions ... it is my first bug > report. > -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
