diagonals: Block Diagonal Extraction or Replacement
Several tools for handling block-matrix diagonals and similar
constructs are implemented. Block-diagonal matrices can be extracted or removed
using two small functions implemented here. In addition, non-square matrices
are supported. Block diagonal matrices occur when two dimensions of a data set
are combined along one edge of a matrix. For example, trade-flow data in the
'decompr' and 'gvc' packages have each country-industry combination occur along
both edges of the matrix.
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