Checks or fixes the given distance matrix specification and returns an
matrix object with 0s in the diagonal.
an object (or list of objects) specifying a distance matrix
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
object and return the corresponding distance matrix (see above).
matrix object (or list of such objects) of the
same dimension as
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