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  Grid graphics provides an alternative to the standard R graphics.
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  Grid graphics provides an alternative to the standard R graphics.
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  The user is able to define arbitrary rectangular regions (called
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  The user is able to define arbitrary rectangular regions (called
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  \emph{viewports}) on the graphics device and define a number of
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  \emph{viewports}) on the graphics device and define a number of
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  coordinate systems for each region.  Drawing can be specified to occur
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  coordinate systems for each region.  Drawing can be specified to occur
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  in any viewport using any of the available coordinate systems.
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  in any viewport using any of the available coordinate systems.
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  Grid graphics and standard R graphics do not mix!
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  Grid graphics and standard R graphics do not mix!
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  Type \code{library(help = grid)} to see a list of (public)
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  Type \code{library(help = grid)} to see a list of (public)
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  Grid graphics functions.
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  Grid graphics functions.
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}
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}
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  \code{\link{viewport}},
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  \code{\link{viewport}},
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  \code{\link{grid.layout}}, and
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  \code{\link{grid.layout}}, and
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  \code{\link{unit}}.
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  \code{\link{unit}}.
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}
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}
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\examples{
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\examples{
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## Diagram of a simple layout
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## Diagram of a simple layout
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grid.show.layout(grid.layout(4,2,
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grid.show.layout(grid.layout(4,2,
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                     heights=unit(rep(1, 4),
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                     heights=unit(rep(1, 4),
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                                  c("lines", "lines", "lines", "null")),
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                                  c("lines", "lines", "lines", "null")),
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                     widths=unit(c(1, 1), "inches")))
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                     widths=unit(c(1, 1), "inches")))
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## Diagram of a sample viewport
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## Diagram of a sample viewport