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cs.IR2007★ 1 cited
The Haar Wavelet Transform of a Dendrogram: Additional Notes
Fionn Murtagh
We consider the wavelet transform of a finite, rooted, node-ranked, -way tree, focusing on the case of binary () trees. We study a Haar wavelet transform on this tree. Wa…
cs.IR2007★ 2 cited
Ontology from Local Hierarchical Structure in Text
F. Murtagh, J. Mothe, K. Englmeier
We study the notion of hierarchy in the context of visualizing textual data and navigating text collections. A formal framework for ``hierarchy'' is given by an ultrametric topolog…