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  \item{id.lengths}{A numeric vector used to separate locations in \code{x} and
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  \item{id.lengths}{A numeric vector used to separate locations in \code{x} and
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    \code{y} into multiple polygons.  Specifies consecutive blocks of
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    \code{y} into multiple polygons.  Specifies consecutive blocks of
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    locations which make up separate polygons.}
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    locations which make up separate polygons.}
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  \item{default.units}{A string indicating the default units to use
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  \item{default.units}{A string indicating the default units to use
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    if \code{x}, \code{y}, \code{width}, or \code{height}
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    if \code{x}, \code{y}, \code{width}, or \code{height}
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    are only given as numeric vectors.}
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    are only given as numeric vectors.}
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  \item{name}{ A character identifier. }
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  \item{name}{ A character identifier. }
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  \item{gp}{An object of class \code{gpar}, typically the output
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  \item{gp}{An object of class \code{gpar}, typically the output
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    from a call to the function \code{gpar}.  This is basically
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    from a call to the function \code{gpar}.  This is basically
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    a list of graphical parameter settings.}
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    a list of graphical parameter settings.}
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  \item{draw}{A logical value indicating whether graphics output
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  \item{draw}{A logical value indicating whether graphics output
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  A grob object.
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  A grob object.
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}
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}
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\details{
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\details{
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  Both functions create a polygon grob (a graphical object describing a
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  Both functions create a polygon grob (a graphical object describing a
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  polygon), but only \code{grid.polygon}
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  polygon), but only \code{grid.polygon}
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  draws the polygon (and then only if \code{draw} is \code{TRUE}).
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  draws the polygon (and then only if \code{draw} is \code{TRUE}).
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}
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}
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\author{Paul Murrell}
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\author{Paul Murrell}
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\seealso{
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\seealso{
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  \link{Grid},
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  \link{Grid},
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  \code{\link{viewport}}
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  \code{\link{viewport}}