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With these basic tools in place, the dimensional stacking technique can be used interactively to perform a search of a high-dimensional space for structure in the style of manual projection pursuit. As mentioned, structure can take such forms as patterns, clusters, and surfaces. Other features of interest include minima, maxima, and anomalies. The examples included below show how the N-Land environment can be used to locate such items of interest.

In each case, a general search strategy is followed. First, the channel and speed are selected that seem to display some relevant structure (e.g. clusters or repeated patterns). Then, any necessary rotation or shearing is performed to enhance the structure. Finally, clipping is performed to only display the part of the data space that is of interest. This process can be repeated as often as needed to slowly bring out the structure in the data. Modifying color, binning, and overlap strategies may also be used to help the search.


Matthew Ward