William Stein wrote: > sage: a = RIF(1/5) > sage: a == a > False > sage: a is a > True
That's how interval arithmetic usually works! Quoting from the documentation of real_mpfi: | Comparison operations (``==``, ``!=``, ``<``, ``<=``, ``>``, ``>=``) | return ``True`` if every value in the first interval has the given | relation to every value in the second interval. | [...] | This convention for comparison operators has good and bad points. | [...] > However, > > sage: a.lower() == a.lower() > True > sage: a.upper() == a.upper() > True > > The code to compare intervals is here: > > https://github.com/sagemath/sage/blob/master/src/sage/rings/real_mpfi.pyx#L3517 > > It looks like it just compares the endpoints, so I don't understand > why a == a is false... That's because you are looking at the wrong function; intervals also implement richcmp. -- Marc -- 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
