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       [\code{xmin}, \code{xmax}].}
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       [\code{xmin}, \code{xmax}].}
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  \item{xmin, xmax}{left-hand and right-hand endpoint of the
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  \item{xmin, xmax}{left-hand and right-hand endpoint of the
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       interpolation interval (when \code{xout} is unspecified).}
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       interpolation interval (when \code{xout} is unspecified).}
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  \item{xout}{an optional set of values specifying where interpolation
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  \item{xout}{an optional set of values specifying where interpolation
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    is to take place.}
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    is to take place.}
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  \item{ties}{handling of tied \code{x} values.  Either a function
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  \item{ties}{handling of tied \code{x} values.  The string
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    with a single vector argument returning a single number result or
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    \code{"ordered"} or a function (or the name of a function) taking a
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    the string \code{"ordered"} or a length-2 \code{\link{list}} of both,
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    single vector argument and returning a single number or a length-2
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    see \code{\link{approx}} and its \sQuote{Details} section, and the
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    \code{\link{list}} of both, see \code{\link{approx}} and its
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    example below.}
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    \sQuote{Details} section, and the example below.}
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}
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}
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\details{
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\details{
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  The inputs can contain missing values which are deleted, so at least
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  The inputs can contain missing values which are deleted, so at least
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  one complete \code{(x, y)} pair is required.
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  one complete \code{(x, y)} pair is required.
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  If \code{method = "fmm"}, the spline used is that of Forsythe, Malcolm
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  If \code{method = "fmm"}, the spline used is that of Forsythe, Malcolm