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MathGroup Archive 2004

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How to modify Convex Hull program to give output as Cartesian Coordinates?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg48760] How to modify Convex Hull program to give output as Cartesian Coordinates?
  • From: gilmar.rodriguez at nwfwmd.state.fl.us (Gilmar Rodr?guez Pierluissi)
  • Date: Tue, 15 Jun 2004 02:50:06 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Greetings Mathematica Group!:

I use the following example, to formulate my question:

In[1]: data2D = {{4.4, 14}, {6.7, 15.25}, {6.9, 12.8}, {2.1, 11.1},
                {9.5, 14.9},{13.2, 11.9}, {10.3, 12.3}, {6.8, 9.5},
                {3.3, 7.7}, {0.6, 5.1},{5.3, 2.4},{8.45, 4.7},
                {11.5, 9.6},{13.8, 7.3}, {12.9, 3.1}, {11, 1.1}};

In[2]: << DiscreteMath`ComputationalGeometry`

In[3]: convexhull = ConvexHull[data2D]

Out[3]: {14,6,5,2,1,4,10,11,16,15}

My question is:

Is there any way to modify the ConvexHull program to give the
Cartesian coordinates of the points corresponding to the values
14,6,5,2,1,4,10,11,16,15; instead of Out[3] above?

Thank you!


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