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The Incomplete Beta Function
Syntax betai(a, b, x)
See Also beta , gammln , erf

Description
Returns the element-by-element incomplete beta function
                             x
                      1     /   (a - 1)       (b - 1)
betai(a, b, x) = ---------- |  t       (1 - t)       dt
                 beta(a, b) /
                             0
where a, b, and x are real or double-precision matrices and 0 < x(i,j) < 1.

Example
     x = {0. : .05 : 1.}
     a = 8.
     b = 10.
     gplot(x, betai(a, b, x))
     
 returns the following plot: