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Built-in Mathematica Symbol

MatrixQ

MatrixQ[expr]
gives True if expr is a list of lists or a two-dimensional SparseArray object that can represent a matrix, and gives False otherwise.

MatrixQ[expr, test]
gives True only if test yields True when applied to each of the matrix elements in expr.

MatrixQ[expr] gives True only if expr is a list, and each of its elements is a list of the same length, containing no elements that are themselves lists, or if expr is a two-dimensional SparseArray object.

Test of whether an object is a matrix:

These are not matrices:

Use tests to generalize and specialize:

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