Affirm whether a species abundance matrix is valid (no NAs, no zero-sum rows, no zero-sum columns, all data 'connected').
array of species data, where rows = SUs and cols = species
logical, check whether data are connected,
further arguments passed to other methods
Often useful before further analysis such as calculating certain
dissimilarity measures or during rejection sampling of simulated
data. Data are strictly 'connected' when all sample units share
the same species pool (no disconnected species pools), checked
distconnected and Bray-Curtis
TRUE == valid,
FALSE == not valid.
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