Checks or fixes the given distance matrix specification and returns an equivalent, symmetric matrix object with 0s in the diagonal.




an object (or list of objects) specifying a distance matrix


a symmetric matrix object (or list of such objects) of the same dimension as x


If the argument is a matrix, check whether it is a valid specification of a distance matrix and return it, making it symmetric if it isn't already.

If the argument is a list, calls check.dist on every of its elements and returns a list of the results.

For all other object types, attempts to coerce the argument to a dist object and return the corresponding distance matrix (see above).

See also