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Rev 85990 Rev 88908
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    should be computed, i.e., \eqn{ (f(x+h) - f(x-h)) / 2h }.  These are
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    should be computed, i.e., \eqn{ (f(x+h) - f(x-h)) / 2h }.  These are
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    typically more accurate but need more evaluations of \eqn{f()}.}
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    typically more accurate but need more evaluations of \eqn{f()}.}
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}
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}
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\details{
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\details{
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  This is a front end to the C function \code{numeric_deriv}, which is
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  This is a front end to the C function \code{numeric_deriv}, which is
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  described in \emph{Writing R Extensions}.
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  described in Section \manual{R-exts}{Calculating numerical derivatives}.
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  The numeric variables must be of type \code{double} and not \code{integer}.
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  The numeric variables must be of type \code{double} and not \code{integer}.
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  %% checked in C code .. why not just coerce them?   (TODO?)
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  %% checked in C code .. why not just coerce them?   (TODO?)
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}
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}
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\value{
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\value{