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  applicable, \code{gradient} and \code{hessian}.  The parameter vector
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  applicable, \code{gradient} and \code{hessian}.  The parameter vector
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  will be coerced to double.
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  will be coerced to double.
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  The PORT documentation is at
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  The PORT documentation is at
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  \url{http://netlib.bell-labs.com/cm/cs/cstr/153.pdf}.
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  \url{http://netlib.bell-labs.com/cm/cs/cstr/153.pdf}.
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  The parameter vector passed to \code{objective}, \code{gradient} and
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  The parameter vector passed to \code{objective}, \code{gradient} and
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  \code{hessian} has special semantics and is shared between calls.  The
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  \code{hessian} has special semantics and is shared between calls.  The
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  functions should not copy it.
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  functions should not copy it.
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  If any of the functions returns \code{NA} or \code{NaN} the internal code
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  If any of the functions returns \code{NA} or \code{NaN} the internal code
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  could infinite-loop in \R prior to 2.15.2: this is now an error for
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  could infinite-loop in \R prior to 2.15.2: this is now an error for
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  the gradient and Hessian, and such values for function evaluation are
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  the gradient and Hessian, and such values for function evaluation are
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  replaced by \code{+Inf} with a warning.
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  replaced by \code{+Inf} with a warning.
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}
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}