Hello everybody !!! The french speakers who read the other post in this forum already know that I am having a hard time with posets, and it may very well be my fault.
But come on.... Just look at that !!! -------------- sage: Permutations(10).random_element() [9, 2, 6, 7, 5, 4, 10, 8, 1, 3] sage: # I build the poset on the *indices* of p, not on the elements of p, because in my situation the elements of P are not hashable sage: p = [9, 2, 6, 7, 5, 4, 10, 8, 1, 3] sage: comparison = lambda x,y : (p[x] % p[y] == 0) sage: P = Poset( (range(len(p)), comparison) ) sage: m = P.minimal_elements() sage: map( lambda x: p[x], m) --------------------------------------------------------------------------- TypeError Traceback (most recent call last) /home/ncohen/<ipython console> in <module>() /home/ncohen/<ipython console> in <lambda>(x) TypeError: list indices must be integers, not FinitePoset_with_category.element_class sage: map(type, m) [<class 'sage.combinat.posets.elements.FinitePoset_with_category.element_class'>, <class 'sage.combinat.posets.elements.FinitePoset_with_category.element_class'>, <class 'sage.combinat.posets.elements.FinitePoset_with_category.element_class'>, <class 'sage.combinat.posets.elements.FinitePoset_with_category.element_class'>, <class 'sage.combinat.posets.elements.FinitePoset_with_category.element_class'>] sage: Integer(m[0]) --------------------------------------------------------------------------- TypeError Traceback (most recent call last) /home/ncohen/<ipython console> in <module>() /home/ncohen/.Sage/local/lib/python2.7/site-packages/sage/rings/integer.so in sage.rings.integer.Integer.__init__ (sage/rings/integer.c:7412)() TypeError: unable to coerce <class 'sage.combinat.posets.elements.FinitePoset_with_category.element_class'> to an integer sage: ---------------- So -of course- it is somewhoe my fault because the objects in my Poset are graphs, that you asked me to make them hashable a looooong time ago, and that I still have not done it... But come on, I put integers in my Poset and what I get can not even be coerced to Integer type ! O_o;;;; Nathann -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To post to this group, send email to sage-combinat-devel@googlegroups.com. To unsubscribe from this group, send email to sage-combinat-devel+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sage-combinat-devel?hl=en.
