Details and Options
- AntisymmetricMatrixQ is also known as skew-symmetric.
- A matrix m is antisymmetric if m-Transpose[m].
- AntisymmetricMatrixQ works for symbolic as well as numerical matrices.
- The following options can be given:
SameTest Automatic function to test equality of expressions Tolerance Automatic tolerance for approximate numbers
- For exact and symbolic matrices, the option SameTest->f indicates that two entries mij and mkl are taken to be equal if f[mij,mkl] gives True.
- For approximate matrices, the option Tolerance->t can be used to indicate that all entries Abs[mij]≤t are taken to be zero.
- For matrix entries Abs[mij]>t, equality comparison is done except for the last bits, where is $MachineEpsilon for MachinePrecision matrices and for matrices of Precision .
Examplesopen allclose all
Approximate MachinePrecision matrix:
Adjust the option Tolerance to accept this matrix as antisymmetric:
Using Table generates an antisymmetric matrix:
SymmetrizedArray can generate matrices (and general arrays) with symmetries:
Properties & Relations (9)
A matrix is antisymmetric if m-Transpose[m]:
Use SymmetricMatrixQ to test whether a matrix is symmetric:
Use NormalMatrixQ to test whether the matrix is normal:
Eigenvalues for a real antisymmetric matrix are on the imaginary axis:
Use Eigenvalues to find eigenvalues:
CharacteristicPolynomial for such a matrix contains even powers only:
Use Eigenvectors to find eigenvectors:
Det for a real antisymmetric matrix of odd order is zero:
MatrixExp of an antisymmetric matrix is orthonormal:
An antisymmetric matrix is always diagonalizable as tested with DiagonalizableMatrixQ: