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\name{grid.lines}
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\name{grid.lines}
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\alias{grid.lines}
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\alias{grid.lines}
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%- Also NEED an `\alias' for EACH other topic documented here.
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\title{Draw Lines in a Grid Viewport}
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\title{Draw Lines in a Grid Viewport}
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\description{
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\description{
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  This function draws a series of lines within a Grid viewport.
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  This function draws a series of lines within a Grid viewport.
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}
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}
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\usage{
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\usage{
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grid.lines(x = unit(c(0, 1), "npc", units.per.obs),
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grid.lines(x = unit(c(0, 1), "npc", units.per.obs),
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       y = unit(c(0, 1), "npc", units.per.obs),
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       y = unit(c(0, 1), "npc", units.per.obs),
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       default.units = "npc", units.per.obs = FALSE,
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       default.units = "npc", units.per.obs = FALSE,
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       gp=gpar(), draw = TRUE, vp = NULL)
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       gp=gpar(), draw = TRUE, vp = NULL)
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}
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}
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%- maybe also `usage' for other objects documented here.
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\arguments{
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\arguments{
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  \item{x}{A numeric vector or unit object specifying x-values.}
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  \item{x}{A numeric vector or unit object specifying x-values.}
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  \item{y}{A numeric vector or unit object specifying y-values.}
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  \item{y}{A numeric vector or unit object specifying y-values.}
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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} or \code{y} are only given as numeric vectors.}
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    if \code{x} or \code{y} are only given as numeric vectors.}
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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}}
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}
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}
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\examples{
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\keyword{dplot}
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}
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\keyword{ dplot }%-- one or more ...
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