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Re: two plots in Mathemtica 7. Bug?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg95750] Re: two plots in Mathemtica 7. Bug?
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Mon, 26 Jan 2009 05:02:00 -0500 (EST)
  • Organization: The Open University, Milton Keynes, UK
  • References: <glj880$dhn$1@smc.vnet.net>

In article <glj880$dhn$1 at smc.vnet.net>,
 "sv07171024" <steven_504 at telenet.be> wrote:

> when I execute
> 
> << ComputationalGeometry`;nodes = Table[Random[], {20}, {2}]; 
> DiagramPlot[nodes] ; PlanarGraphPlot[nodes]
> 
> in Mathematica 7 I only get the latter (the Delaunay diagram), while,

This is the correct --=and expected--- behavior since Mathematica 6.0, 
for a ";" semicolon prevent the display of results returned by 
expressions and graphics are no longer side-effects: graphics outputs 
are the result of evaluation, so they can be turn on or off as any other 
expressions.

> IIRC, Mathematica 6 showed both. 

No, see above for explanation. Also, to display graphics in coupound 
expressons, you must use Print[].

> I found that I could get both plots if
> I add a second semi-column between the plot statement. In this case
> they are put side by side rather than above each other, with the
> semi-columns between them.  A bug? 

Not sure about that one.

Anyway, either of below examples will display both graphs in separate 
output cells.

<< ComputationalGeometry`;
nodes = Table[Random[], {20}, {2}]; 
DiagramPlot[nodes]
PlanarGraphPlot[nodes]

<< ComputationalGeometry`;
nodes = Table[Random[], {20}, {2}]; 
Print[DiagramPlot[nodes]] ; 
PlanarGraphPlot[nodes]

Regards,
--Jean-Marc


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