On Oct 13, 2007, at 11:22 AM, Jason Grout wrote:
mabshoff wrote:
>> On Oct 13, 10:10 am, "William Stein" <[EMAIL PROTECTED]> wrote:
[snip]
> This is odd.  The test passes on my Ubuntu 32-bit P4 system.  It looks
> like the edges are returned in a different order for you, so the  
> answer
> is correct, just output differently.
>
> I can't build the alpha right now, but someone that has the alpha  
> built,
> can you see if the following code returns the indicated result?  If  
> so,
> we can change the doctest to the following.
>
> sage: g=DiGraph([[1..4], lambda i,j: i<j])
> sage: h=g.line_graph()
> sage: h.vertices()
> [(1, 2, None),
>  (1, 3, None),
>  (1, 4, None),
>  (2, 3, None),
>  (2, 4, None),
>  (3, 4, None)]
> sage: h.am()
> [0 0 0 1 1 0]
> [0 0 0 0 0 1]
> [0 0 0 0 0 0]
> [0 0 0 0 0 1]
> [0 0 0 0 0 0]
> [0 0 0 0 0 0]

Built from scratch on a Mac OS X (10.4.10) Core Duo.  The tests  
aren't complete, but many are failing.  For this, I get:

sage: g=DiGraph([[1..4], lambda i,j: i<j])
sage: h=g.line_graph()
sage: h.vertices()

[(1, 2, None),
  (1, 3, None),
  (1, 4, None),
  (2, 3, None),
  (2, 4, None),
  (3, 4, None)]
sage: h.am()

[0 0 0 1 1 0]
[0 0 0 0 0 1]
[0 0 0 0 0 0]
[0 0 0 0 0 1]
[0 0 0 0 0 0]
[0 0 0 0 0 0]

Justin

--
Justin C. Walker, Curmudgeon at Large
Institute for the Absorption of Federal Funds
-----------
If it weren't for carbon-14, I wouldn't date at all.
-----------



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