SEARCH MATHEMATICA 8 DOCUMENTATION

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Developer Package Symbol

PackedArrayQ

PackedArrayQ[expr]
returns True if expr is a packed array in its internal representation, and returns False otherwise.

PackedArrayQ[expr, type]
returns True if expr is a packed array of objects of the specified type.

PackedArrayQ[expr, type, rank]
returns True if expr is a packed array of the specified rank.

To use PackedArrayQ, you first need to load the Developer Utilities Package using Needs["Developer`"].