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MatrixQ—Wolfram Language Documentation

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BUILT-IN SYMBOL

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.

Details Examplesopen allclose all Basic Examples  (3)

Test of whether an object is a matrix:

These are not matrices:

Use tests to generalize and specialize:

Scope  (2)

Test if a matrix has positive (real) entries:

Test if a matrix has real numeric entries:

Faster test for real-valued numbers:

Applications  (1)

Define a function that only evaluates for explicit matrices:

This represents the Hermitian part of a matrix symbolically:

This gets the Hermitian part explicitly:

Properties & Relations  (3) History

Introduced in 1988 (1.0) | Updated in 2003 (5.0)

Wolfram Research (1988), MatrixQ, Wolfram Language function, https://reference.wolfram.com/language/ref/MatrixQ.html (updated 2003). Text

Wolfram Research (1988), MatrixQ, Wolfram Language function, https://reference.wolfram.com/language/ref/MatrixQ.html (updated 2003).

CMS

Wolfram Language. 1988. "MatrixQ." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2003. https://reference.wolfram.com/language/ref/MatrixQ.html.

APA

Wolfram Language. (1988). MatrixQ. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/MatrixQ.html

BibTeX

@misc{reference.wolfram_2025_matrixq, author="Wolfram Research", title="{MatrixQ}", year="2003", howpublished="\url{https://reference.wolfram.com/language/ref/MatrixQ.html}", note=[Accessed: 11-July-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_matrixq, organization={Wolfram Research}, title={MatrixQ}, year={2003}, url={https://reference.wolfram.com/language/ref/MatrixQ.html}, note=[Accessed: 11-July-2025 ]}


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