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15.5.313 ibeta

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