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Re: can't translate 3D model to 0,0,0

  • To: mathgroup at smc.vnet.net
  • Subject: [mg88420] Re: can't translate 3D model to 0,0,0
  • From: Szabolcs Horvát <szhorvat at gmail.com>
  • Date: Mon, 5 May 2008 06:11:33 -0400 (EDT)
  • Organization: University of Bergen
  • References: <fvhe4g$3v9$1@smc.vnet.net>

will parr wrote:
> Dear Math Forum,
> 
> I have a problem with translating some 3D models to 0,0,0. I have been using the following code:
> 
> ma = Mean@a; ac = # + ({0, 0, 0} - ma) & /@ a;
> 
> where "a" is a 3D model made up of many 3D coordinates. However, this code does not work - in that the new centroid (mean) of the model is not at 0,0,0. can anyone suggest an alternative method?
> 

What does 'a' contain exactly?

In[1]:= a = RandomReal[1, {100, 3}];

In[2]:= ma = Mean[a];

In[3]:= Mean[# - ma & /@ a]
Out[3]= {-1.55431*10^-17, -6.66134*10^-18, 4.44089*10^-18}

I get {0,0,0} for the mean (as expected).


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