opticskxi: OPTICS K-Xi Density-Based Clustering

#' @importFrom ggplot2 aes coord_cartesian element_blank
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#'                     geom_segment ggplot ggplotGrob guides guide_legend
#'                     labs scale_color_manual stat_ellipse theme theme_bw 
#' @importFrom Matrix rowScale
#' @importFrom rlang .data
#' @importFrom stats as.dist median na.omit setNames var
#' @importFrom utils head tail
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#' Pipe
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#' Pipe an object forward into a function or call expression.
#' Magrittr imported function, see details and examples in the magrittr package.
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#' @importFrom magrittr %>%
#' @name %>%
#' @rdname pipe
#' @param lhs A value or the magrittr placeholder.
#' @param rhs A function call using the magrittr semantics.
#' @return Result of rhs applied to lhs, see details in magrittr package.
#' @export
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#' Assignment pipe
#'
#' Pipe an object forward into a function or call expression and update the
#' `lhs` object with the resulting value.
#' Magrittr imported function, see details and examples in the magrittr package.
#'
#' @importFrom magrittr %<>%
#' @name %<>%
#' @rdname compound
#' @param lhs An object which serves both as the initial value and as target.
#' @param rhs a function call using the magrittr semantics.
#' @return None, used to update the value of lhs.
#' @export
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#' Exposition pipe
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#' Expose the names in `lhs` to the `rhs` expression.
#' Magrittr imported function, see details and examples in the magrittr package.
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#' @importFrom magrittr %$%
#' @name %$%
#' @rdname exposition
#' @param lhs A list, environment, or a data.frame.
#' @param rhs An expression where the names in lhs is available.
#' @return Result of rhs applied to one or several names of lhs.
#' @export
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