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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.

MORE INFORMATION

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.

Basic Examples (2)

A vector of numbers is a full array:

A vector in which one element is itself a list is not a full array:

A ragged collection of nested lists is not a full array:

Applications (1)

Properties & Relations (2)

ArrayDepth MatrixQ VectorQ Dimensions PadLeft ArrayFlatten Array

Putting Constraints on Patterns

Nested Lists

Tensors

Elements of Lists

Tensors

Testing Expressions

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