numeric scalar >= 0. Smaller differences are not
considered, see all.equal.numeric.

...

further arguments passed to methods; the matrix method
passes these to all.equal.

Value

logical indicating if object is symmetric or not.

Details

The matrix method is used inside eigen by
default to test symmetry of matrices up to rounding error, using
all.equal. It might not be appropriate in all
situations.

Note that a matrix is only symmetric if its rownames and
colnames are identical.

See Also

eigen which calls isSymmetric when its
symmetric argument is missing.