Computed as:
xy <- x + y
y. <- y / sum(y)
x. <- x / sum(x)
sqrt(sum(((x. - y.)^2) / (xy / sum(xy)))).
Cannot handle NA values. When x and y have zeros in the same
position, NaNs are produced. Please replace these zeros with
pseudo-zeros (i.e. 0.0001) if you wish to use this distance metric.
See also
Other Rcpp_distance_methods:
distance_canberra_cpp(),
distance_chebyshev_cpp(),
distance_cosine_cpp(),
distance_euclidean_cpp(),
distance_hamming_cpp(),
distance_hellinger_cpp(),
distance_jaccard_cpp(),
distance_manhattan_cpp(),
distance_russelrao_cpp()