Compute a matrix of at-risk indicators

Most of the optimization is `Icens`

have a one dimensional root-finding component. Since the quantities involved are generally restricted to a subset of *[0, 1]* we use bisection to find the roots. This function is borrowed from package `Icens`

.

We search from `pvec`

in the direction `ndir`

to obtain the new value of `pvec`

that maximizes the likelihood.

It is used in `ModifiedEMICMmac`

and not to be called by the user.

Alain Vandal and Robert Gentleman

Any book on optimization.

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