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ArrayQ—Wolfram Language Documentation

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• See Also
  • ArrayDepth
  • MatrixQ
  • VectorQ
  • Dimensions
  • PadLeft
  • ArrayFlatten
  • Array
• Related Guides
  • Tensors
  • Testing Expressions
  • GPU Computing
  • Elements of Lists
  • GPU Computing with NVIDIA
  • GPU Computing with Apple
• Tech Notes
  • Putting Constraints on Patterns
  • Nested Lists
  • Tensors

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.

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:

Test for a vector:

Test for a matrix:

Test for a vector or a matrix:

Test for a numeric vector:

Test for an array of any depth with numeric entries:

Define a function that only evaluates with arrays:

This constructs the tensor product interpolating polynomial assuming integer coordinates:

The polynomial interpolates the data:

Introduced in 2003 (5.0)

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