RangeError if m and n are so large that the required table cannot be allocated or would take more than
2^29 steps to build (min(m, n) times its length; about 6 to 8 s), or that the table loses its accuracy (near the
center for m = n >= 550 or so; the tails stay available).
Probability mass function of the distribution of the Wilcoxon rank sum statistic (Mann-Whitney U). Equivalent to R's
dwilcox(x, m, n, log = FALSE).Unlike R, memory use grows only with the range of the statistic (at most
m * n / 2), so large samples such asm = n = 500work.