Given a function, F(x, ...), and a scalar y, find
x such that F(x, ...) = y. Note that there is no
checking for the monotonicity of F wrt to x, or that
the interval specified is appropriate to the problem.
Such fine points are entirely the responsibility of
the user/abuser. If the interval specified doesn't
contain a root some automatic attempt to expand the
interval will be made. Originally intended for use
with F as ThreshFDR.
Finv(y, F, interval = c(0, 1), ...)the scalar at which to evaluate the inverse
the function
the domain within which to begin looking
other arguments for the function F
R. Koenker