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Re: graphs and top most nodes


I'm kinda baffled at this code to be honest. 

namely the 

({x_?NumericQ, y_?NumericQ} :>{y, x})

I can't figure out what numeric_q is doing.

because if just go...

({x, y} :> {y, x})

it seems to do nothing

cooll thing was that, 

({x_?NumericQ, y_?NumericQ} :>{y, -x})

will flip the picture upside down.



thanks in advance any insights

sean 

BobHanlon at aol.com wrote in message news:<ce2flp$8p5$1 at smc.vnet.net>...
> Needs["DiscreteMath`Combinatorica`"];
> 
> 
> Table[Show[ShowGraph[CompleteGraph[n] ,   
>            DisplayFunction:>Identity] /. 
>          ({x_?NumericQ,y_?NumericQ}:>{y,x}), 
>        DisplayFunction->$DisplayFunction, 
>        PlotRange->All],{n,3,7}];
> 
> 
> Bob Hanlon
> 
> > In a message dated Sun, 25 Jul 2004 07:15:57 +0000 (UTC), 
> > sean_incali at yahoo.com writes:<< DiscreteMath`Combinatorica`
> > 
> > ShowGraph[CompleteGraph[3]]
> > ShowGraph[CompleteGraph[4]]
> > ShowGraph[CompleteGraph[5]]
> > ShowGraph[CompleteGraph[6]]
> > ShowGraph[CompleteGraph[7]]
> > 
> > shows 5 fully connected graphs. 
> > 
> > and it kinda suggests to me that there is no real rule for defining
> > the location of the the top most node? I mean, the top most node isn't
> > centered.
> > 
> > how do I make it so that the top node is always at the center? is that
> > possible?
> >


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