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\title{Extract Unique Elements}
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\title{Extract Unique Elements}
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\description{
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\description{
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  \code{unique} returns a vector, data frame or array like \code{x}
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  \code{unique} returns a vector, data frame or array like \code{x}
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  but with duplicate  elements removed.
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  but with duplicate  elements removed.
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}
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}
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\synopsis{
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unique(x, incomparables = FALSE, ...)
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\method{unique}{array}(x, incomparables = FALSE, MARGIN = 1, ...)
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}
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\usage{
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\usage{
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unique(x, incomparables = FALSE, \dots)
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unique(x, incomparables = FALSE, \dots)
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unique.array(x, incomparables = FALSE, MARGIN = 1, \dots)
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\method{unique}{array}(x, incomparables = FALSE, MARGIN = 1, \dots)
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}
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}
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\arguments{
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\arguments{
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  \item{x}{an atomic vector or a data frame or an array.}
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  \item{x}{an atomic vector or a data frame or an array.}
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  \item{incomparables}{a vector of values that cannot be compared.
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  \item{incomparables}{a vector of values that cannot be compared.
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    Currently, \code{FALSE} is the only possible value, meaning that all
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    Currently, \code{FALSE} is the only possible value, meaning that all