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(a) dataset7 (142)
(b) dataset13 (113)
(c) dataset15 (184)
(d) dataset22 (141)
(e) dataset34 (217)
(f) spiral (387)
Fig. 6.31 Some artificial datasets used in the experiments, reported in [201] (the
number of points is given in parentheses).
When constraining the number of clusters to 3, this solution is the only
solution not suggested by humans that performed the tests mentioned in
Sect. 6.4.4. The solutions for this same problem given by LEGClust algo-
rithm are shown in Figs. 6.32a and 6.32b.
The spectral clustering algorithms gave some good results for some datasets,
but were unable to resolve some non-convex datasets like the double spiral
problem (Fig. 6.34 and 6.35), which LEGClust did.
