I would rather use
P9 = Graph([[0..8], lambda i,j: abs(i-j) == 1])
since edges have no reason to be ordered with i>j or i<j.
... but that does not answer your question of course ;-)
Vincent
On 14/10/15 18:16, Rob Beezer wrote:
The following used to work (based on regular private doctesting outside of
Sage source code) and give you the path you wanted:
P9 = Graph([[0..8], lambda i,j: i-j == 1])
Now it silently produces an empty graph (9 vertices, no edges). The fix:
P9 = Graph([[0..8], lambda i,j: i-j == -1])
Is this a bug, or does part 4 of the Graph() constructor documentation need
clarification?
Rob
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