ArrayQ

ArrayQ[expr] gives True if expr is a full array or a SparseArray object, and gives False otherwise.

ArrayQ[expr, patt] requires expr to be a full array with a depth that matches the pattern patt.

ArrayQ[expr, patt, test] requires also that test yield True when applied to each of the array elements in expr.

In a full array all parts at a particular level must be lists of the same length.

ArrayQ[expr, 1|2] tests whether expr is either a vector or a matrix.

ArrayQ[expr, _, NumberQ] tests whether expr is a numerical array at all levels.

See Section 2.3.5 and Section 2.4.3.

See also: ArrayDepth, MatrixQ, VectorQ, Dimensions.

New in Version 5.0.

Further Examples