Problem with ListPlotVectorField3D

• To: mathgroup at smc.vnet.net
• Subject: [mg56060] Problem with ListPlotVectorField3D
• From: Alain Cochard <alain at geophysik.uni-muenchen.de>
• Date: Thu, 14 Apr 2005 08:55:56 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

```Mathematica 4.0 for Linux
-- Motif graphics initialized --

In[1]:= <<Graphics`

Here is a vector field:

In[2]:= vecfield={{{0, 0, 4}, {1, 0, 0}}, {{0, 0, 4}, {1, 0, 0}}, {{0, 0, 4}, {1, 0, 0}},
{{0, 0, 4}, {1, 0, 0}}, {{0, 0, 4}, {1, 0, 0}}, {{0, 0, 4}, {1, 0, 0}},
{{0, 0, 4}, {1, 0, 0}}, {{4, 0, 0}, {0, 0, 1}},
{{2, 2*Sqrt[3], 0}, {0, 0, 1/2}}, {{-2, 2*Sqrt[3], 0}, {0, 0, -1/2}},
{{-4, 0, 0}, {0, 0, -1}}, {{-2, -2*Sqrt[3], 0}, {0, 0, -1/2}},
{{2, -2*Sqrt[3], 0}, {0, 0, 1/2}}, {{4, 0, 0}, {0, 0, 1}},
{{0, 0, -4}, {-1, 0, 0}}, {{0, 0, -4}, {-1, 0, 0}},
{{0, 0, -4}, {-1, 0, 0}}, {{0, 0, -4}, {-1, 0, 0}},
{{0, 0, -4}, {-1, 0, 0}}, {{0, 0, -4}, {-1, 0, 0}}, {{0, 0, -4}, {-1, 0, 0}}};

In the following I get only 4 arrows:

Out[3]= -Graphics3D-

In the following I get all the expected arrows (but without the

In[4]:= ListPlotVectorField3D[vecfield]

Out[4]= -Graphics3D-

... in the following, I do get all the expected arrows with heads,
but why?  As I understand, Union is only supposed to sort and
remove duplicates, so what difference does it make as far as
ListPlotVectorField3D is concerned?  Plus I have experimented with
"some amount" of duplication without problem.

In[5]:= ListPlotVectorField3D[Union[vecfield],

Out[5]= -Graphics3D-

Am I doing something wrong?
Thanks,
Alain

```

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