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ibeta(x, a, b [, /complement])
Returns the incomplete beta function: integral over t from 0 to
x of t^(a-1) (1 - t)^(b-1) /
beta(a,b), for x between 0 and 1 (inclusive)
and a, b positive. If keyword
/complement is specified, then one minus this value is returned.
Minus one is returned for illegal parameter combinations.
See also: beta