Returns the pattern obtained by summing \(q_i\) and \(q_{i+1}\).
pcbic.unite(pattern, index1)The pattern of equalities of the eigenvalues, given by the \(K\)-vector (\(Q_1\), ... , \(Q_K\)) as in (13.8).
Index \(i\) where \(1 \le i < K\)
A `vector` containing a pattern.
pcbic, pcbic.stepwise,
and pcbic.subpatterns.
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