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MathGroup Archive 2006

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Re: GraphPlot display anomaly

  • To: mathgroup at smc.vnet.net
  • Subject: [mg72388] Re: [mg72378] GraphPlot display anomaly
  • From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
  • Date: Sun, 24 Dec 2006 03:40:12 -0500 (EST)
  • References: <200612231114.GAA20908@smc.vnet.net>

On 23 Dec 2006, at 20:14, zac wrote:

> Hi All,
>
> try the followings with Mathematica 5.2:
>
>
> Needs["DiscreteMath`GraphPlot`"];
>
> GraphPlot[{1 -> 2},
>     ImageSize -> {50, 50},
>     DisplayFunction -> Evaluate[Display[$Display, #] &]
>     ];
>
>
> Q1. Why does it produce two output graphics?
> Q2. Why does it not work without Evaluate[...]?
> Q3. Why does it work with simply using  DisplayFunction ->
> $DisplayFunction?
>
> May it be that the implementation of option-passing was screwed up in
> DiscreteMath`Graphplot?
>
> Thanks,
>
> Istvan Zachar

The only problem is with your code. The correct way to do this is:


Needs["DiscreteMath`GraphPlot`"];


GraphPlot[{1 -> 2},
     ImageSize -> {50, 50},
     DisplayFunction -> (Display[$Display, #] &)
     ];

Note the crucial parentheses missing from original code.
I think the answers to all your questions should now be self-evident.

Andrzej Kozlowski
Tokyo, Japan


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