check_partition() is used to validate partition matrices.
check_partition(partition)two-dimensional matrix of mode numeric
with rows as types (species), columns as subcommunities, and each
element containing the relative abundance of types in each subcommunity
relative to the metacommunity as a whole. In the phylogenetic case, this
corresponds to the proportional abundance of historical species, which is
calculated from the proportional abundance of terminal taxa
Returns a two-dimensions matrix of mode numeric. If
the partition matrix was valid, this should be identical to that which was
input as an argument.