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


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