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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)
*Reply-to*: alain at geophysik.uni-muenchen.de
*Sender*: owner-wri-mathgroup at wolfram.com
Mathematica 4.0 for Linux
Copyright 1988-1999 Wolfram Research, Inc.
-- 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:
In[3]:= ListPlotVectorField3D[vecfield, VectorHeads -> True]
Out[3]= -Graphics3D-
In the following I get all the expected arrows (but without the
heads). I could stop here and ask why but ...
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],
VectorHeads -> True]
Out[5]= -Graphics3D-
Am I doing something wrong?
Thanks,
Alain
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