| isSymmetric {base} | R Documentation |
Generic function to test if object is symmetric or not.
Currently only a matrix method is implemented.
isSymmetric(object, ...) ## S3 method for class 'matrix' isSymmetric(object, tol = 100 * .Machine$double.eps, ...)
object |
any R object; a |
tol |
numeric scalar >= 0. Smaller differences are not
considered, see |
... |
further arguments passed to methods; the matrix method
passes these to |
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.
logical indicating if object is symmetric or not.
eigen which calls isSymmetric when its
symmetric argument is missing.
isSymmetric(D3 <- diag(3)) # -> TRUE D3[2,1] <- 1e-100 D3 isSymmetric(D3) # TRUE isSymmetric(D3, tol = 0) # FALSE for zero-tolerance