2 hmean - harmonic mean of a number of values
8 x_1, ... arithmetic or list
10 return determined by types of arguments, or null
13 The null value is returned if there are no arguments.
15 If there are n non-list arguments x_1, x_2, ... and the
16 required operations are defined, hmean(x_1, x_2, ...) returns the
19 n/(inverse(x_1) + inverse(x_2) + ... + inverse(x_n)).
21 If an argument x_i is a list as defined by list(y_1, ..., y_m)
22 this is treated as if in (x_1, x_2, ...), x_i is replaced by
27 > c = config("mode", "frac")
28 > print hmean(1), hmean(1,2), hmean(1,2,3), hmean(1,2,3,4), hmean(1,2,0,3)
32 The number of arguments is not to exceed 100.