MatrixQ

MatrixQ(expr)

returns True, if the expr is a matrix (a list of lists). The expr is only a matrix, if all elements are itself a list with the same size.

Related terms

CharacteristicPolynomial, ConjugateTranspose, Det, DiagonalMatrix, Dot, Eigenvalues, Eigenvectors, HilbertMatrix, IdentityMatrix, Inverse, JacobiMatrix, LinearSolve, LUDecomposition, MatrixPower, MatrixRank, NullSpace, SingularValueDecomposition, Tr, Transpose, VandermondeMatrix, VectorQ