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Re: ListPointPlot3D not composable?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg97508] Re: ListPointPlot3D not composable?
  • From: Szabolcs Horvát <szhorvat at gmail.com>
  • Date: Sat, 14 Mar 2009 05:41:49 -0500 (EST)
  • References: <gpdaam$jpn$1@smc.vnet.net>

congruentialuminaire at yahoo.com wrote:
> Hello MathGroup:
> 
> I want to annotate my 3D point plot, so I start with some Epilog
> statements (e.g. Point[]). An example is:
> 
> ListPointPlot3D[ReplacePart[Partition[Range[100], 10]
>    , {{3, 3} -> None, {5, 7} -> I, {8, 4} -> Missing["NotAvailable"]}]
>    , PlotStyle -> PointSize[Large]
>    , Epilog -> Point[{6, 6, 50}]
>    ]
> 
> I kept getting a message like:
> 
> "Array {6, 6, 50} has the wrong dimensions for a graphics coordinate
> list."
> 
> This does not make sense since this works fine:
> 
> Graphics3D@Point[{6, 6, 50}]
> 

This is because Epilog takes 2D graphics primitives, even when used with 
Graphics3D.  Quote from the doc page:

"In three-dimensional graphics, two-dimensional graphics primitives can 
be specified by the Epilog option. The graphics primitives are rendered 
in a 0,1 coordinate system."

I know, this can be confusing ;)

If you need to annotate your plot, use Show[]:

Show[
   PointPlot3D[..., Epilog -> {(* your 2D annotations here *)}],
   Graphics3D[ (* your 3D annotations here *) ]
]

I hope this helps,
Szabolcs


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