You probably want deepcopy. That being said, Q.vertices should probably also make a copy before returning the result. David
On Thu, Apr 11, 2019 at 1:48 AM Narayanan Narayanan <naray...@gmail.com> wrote: > > I have recently created a Polyhedron Q that corresponts to the cuts of a > graph. > > Once I have Q, I created a list of vectors of its vertices as follows: > > V=[s.vector() for s in Q.vertices()] > > Now I create a copy of V > W= copy(V) > > Then I change the 6th co-ordinate of each vector in W as follows > > for i in range(len(W)) : > W[i][5]=0 > > That is when all the hell broke lose. > > The change reflected in V also (all vectors of V had now 6th coordinate 0) > > But that is not the shocking part: call to Q.vertices() now returns > vertices where all have 6th coordinate 0! > > Can someone explain what is going on? > > Narayanan > > > -- > 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. > -- 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.
