Nice technical piece on advanced use of clustering and data visualization. Gives you an example of the kinds of choices being made by data scientists, and their application to a real problem:
" ... R showcases several useful clustering tools, but the one that seems particularly powerful is the marriage of hierarchical clustering with a visual display of its results in a heatmap. The term “heatmap” is often confusing, making most wonder – which is it? A "colorful visual representation of data in a matrix" or "a (thematic) map in which areas are represented in patterns ("heat" colors) that are proportionate to the measurement of some information being displayed on the map"? For our sole clustering purpose, the former meaning of a heatmap is more appropriate, while the latter is a choropleth. ... "
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