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  \code{deriv} and \code{deriv3} normally return an
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  \code{deriv} and \code{deriv3} normally return an
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  \code{\link{expression}} object whose evaluation returns the function
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  \code{\link{expression}} object whose evaluation returns the function
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  values with a \code{"gradient"} attribute containing the gradient
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  values with a \code{"gradient"} attribute containing the gradient
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  matrix.  If \code{hessian} is \code{TRUE} the evaluation also returns
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  matrix.  If \code{hessian} is \code{TRUE} the evaluation also returns
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  a \code{"hessian"} attribute containing the Hessian array.
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  a \code{"hessian"} attribute containing the Hessian array.
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  If \code{function.arg} is not \code{NULL}, \code{deriv} and
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  If \code{function.arg} is not \code{NULL}, \code{deriv} and
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  \code{deriv3} return a function with those arguments rather than an
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  \code{deriv3} return a function with those arguments rather than an
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  expression.
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  expression.
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}
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}
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\references{
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\references{