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ArrayRules

ArrayRules[SparseArray[...]]
gives the rules {pos1->val1, pos2->val2, ...} specifying elements in a sparse array.
ArrayRules[list]
gives rules for SparseArray[list].
  • The last element of ArrayRules[s] is always {_, _, ...}->def, where def is the default value for unspecified elements in the sparse array.  »
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