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PO
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2011-07-03T15:05:16.770
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2011-07-05T11:36:06.750
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2011-07-05T11:36:06.750
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Among the new objects in MMA 8 are <a href="http://reference.wolfram.com/mathematica/ref/TreeGraph.html" rel="nofollow noreferrer">TreeGraph</a>, <a href="http://reference.wolfram.com/mathematica/ref/CompleteKaryTree.html?q=CompleteKaryTree&lang=en" rel="nofollow noreferrer">CompleteKaryTree</a>, and <a href="http://reference.wolfram.com/mathematica/ref/KaryTree.html?q=KaryTree&lang=en" rel="nofollow noreferrer">KaryTree</a>. The latter two objects give binary trees by default. I don't know how efficient they are for intensive computation but they do seem well-suited for displaying classifications. And there are many predicates and options for manipulating and displaying them. Here's an example of a classification tree from [Breiman, L. Classification and Regression Trees: Chapman & Hall/CRC, 1984.]. It concerns 3 questions to determine whether a cardiac patient is likely to die within 30 days if not treated. <pre><code>KaryTree[9, 2, VertexLabels -> {1 -> "Blood pressure > 91 ?", 2 -> "Age > 62.5?", 4 -> "Sinus tachycardia ?", 8 -> "< 30 days"}, EdgeLabels -> {1 \[UndirectedEdge] 2 -> "yes", 1 \[UndirectedEdge] 3 -> "no", 2 \[UndirectedEdge] 4 -> "yes", 2 \[UndirectedEdge] 5 -> "no", 4 \[UndirectedEdge] 8 -> "yes", 4 \[UndirectedEdge] 9 -> "no"}, ImagePadding -> 20] </code></pre> <img src="https://i.stack.imgur.com/d3oLx.png" alt="Classification graph"> I'd like to get rid of the two unused nodes on the right, but have not figured out a an elegant way to do it. So I think I'll post a simple question about that on SO.
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1. POclassification tree implementation in mathematica
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1. USDavidC
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1. USDavidC
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1. COthank you .. I really appreciate that .. :)
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 USOmar Osama

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