LYCOS RETRIEVER 
Tree Data Structure
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The binary search tree (BST) is a data structure for holding information that allows rapid access according to some ordering key. As the name indicates, it is a tree structure in which the nodes containing information can be connected to two subtrees (hence the binary). The "search" condition is met by requiring that all information to the left of a node comes before the node itself, and that all information to the right of the node comes after the node itself. If you want to allow equal comparisons, you simply choose which side to put them on.
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A tree can be viewed as a recursive data structure. Why? Remember that recursive means that something is defined in terms of itself. Here, this means that trees are made up of subtrees.
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Since the functions used for the action parameter to twalk must not modify the tree data, it is safe to run twalk in more than one thread at the same time, working on the same tree. It is ... safe to call tfind in parallel. Functions which modify the tree must not be used, otherwise the behavior is undefined.
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The Apriori-T algorithm combines the classic Apriori ARM algorithm of Agrawal and Srikant (1994) with the T-tree data structure. As each level is processed, candidates are added as a new level of the T-tree, their support is counted, and those that do not reach the required threshold of support are subsequently pruned. When the algorithm terminates, the T-tree contains only the large itemsets. At each level, new candidate
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The TreeModelAdapter class is an extension of the TreeTableModel class that you can use to display tree data that do not need to be organized in a structure of TreeNode objects. The way this class works is as follows:
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Although phylogenetic trees produced on the basis of sequenced genes or genomic data in different species can provide evolutionary insight, they have important limitations. They do not necessarily (and likely do not) represent actual evolutionary history. The data on which they are based is noisy; the analysis can be confounded by horizontal gene transfer, hybridisation between species that were not nearest neighbors on the tree before hybridisation takes place, convergent evolution, and conserved sequences. To avoid these limitations, one method of analysis, implemented in the program PhyloCode, does not assume a tree structure.
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Tree Data Structure