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FIGURE 5.7 (SEE COLOR INSERT FOLLOWING PAGE 130.) :
Pixel plot of the raw Enron term-by-email matrix.
very useful next step is to display the clustering results visually. We demon-
strate the value of this by considering once again the Enron email dataset
described in Section 5.4. The raw term-by-email matrix for this dataset ap-
pears to have no structure, as shown in the pixel plot of Figure 5.7. Each
nonzero entry in the raw matrix is represented by a pixel, and the magnitude
of the entry is captured by the intensity of the pixel.
 
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