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Re: FromAdjacencyMatrix / FromAdjacencyLists - broken? Workaround?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg104323] Re: FromAdjacencyMatrix / FromAdjacencyLists - broken? Workaround?
  • From: Andrew <dr.a.graham at googlemail.com>
  • Date: Tue, 27 Oct 2009 05:01:09 -0500 (EST)
  • References: <hbr57n$rg1$1@smc.vnet.net> <hbu80f$7k5$1@smc.vnet.net>

Looks like it's definitely a bug.

Syd Geraghty helpfully emailed to say that he got the same results on
his (Intel) Mac system running 7.0.1

Is it a 7.0.1 problem or could it be Intel chip-related?

Any other contributions welcome, including how to work around this in
the short term...

Best

Andrew

...

Andrew,
I get exactly the same output as you on my system detailed below.
Bug!
Cheers .... Syd
Syd Geraghty B.Sc, M.Sc.
Mathematica 7.0.1 for Mac OS X x86 (64 - bit) (18th February 2009)
MacOS X V 10.6 Snow LeopardMacBook Pro 2.33 GHz Intel Core 2 Duo  2GB
RAM

...

On Oct 24, 6:48 am, Andrew <dr.a.gra... at googlemail.com> wrote:
> I can't see the post in my browser, but Tom Dowling helpfully emailed
> to say that on his Mac (non-Intel) running Mathematica 7.0.0 the code
> above ran fine!
>
> I'm using 7.0.1 on a windows (32 bit) platform, OS XP Pro SP3. Just to
> check I'm not deluding myself, I ran an abbreviated version of the
> steps above again. Here's the inputs & outputs shown:
>
> In[1]:=    << "Combinatorica`"
>
> In[2]:=    Edges[Cycle[3, Type -> Directed]]
> Out[2]=  {{1, 2}, {2, 3}, {3, 1}}
>
> In[3]:=    Edges[FromAdjacencyMatrix[
>   ToAdjacencyMatrix[Cycle[3, Type -> Directed], Type -> Directed],
>   Type -> Directed]]
> Out[3]=  {{1, 2}, {2, 3}, {1, 3}}
>
> Is it just my system or can anyone else reproduce this?
>
> Best regards
> Andrew


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