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Dimensions

Dimensions[expr]
gives a list of the dimensions of expr.
Dimensions[expr, n]
gives a list of the dimensions of expr down to level n.
  • expr must be a full array, with all the pieces of expr at a particular level having the same length. (The elements of expr can then be thought of as filling up a hyper-rectangular region.)
  • Each successive level in expr sampled by Dimensions must have the same head.
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