Given a partial alternating sign matrix or a permutation in 1-line notation, computes the Castelnuovo-Mumford regularity of the quotient by the corresponding alternating sign matrix ideal or Schubert determinantal ideal. In the case of a permutation in 1-line notation, computes the Castelnuovo-Mumford regularity of the corresponding Schubert determinantal ideal by implementing Theorem 1.1 of
In the case of a partial permutation, computes the regularity using the antidiagonal initial ideal, a valid strategy in light of
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The object schubertRegularity is a method function.