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\code{par("las")} determines the adjustment. For strings plotted
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\code{par("las")} determines the adjustment. For strings plotted
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perpendicular to the axis the default is to centre the string.}
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perpendicular to the axis the default is to centre the string.}
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\item{gap.axis}{an optional (typically non-negative) numeric factor to
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\item{gap.axis}{an optional (typically non-negative) numeric factor to
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be multiplied with the size of an \sQuote{m} to determine the
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be multiplied with the size of an \sQuote{m} to determine the
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minimal gap between labels that are drawn, see \sQuote{Details}.
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minimal gap between labels that are drawn, see \sQuote{Details}.
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The default, \code{NA}, corresponds to \code{1} when tick labels drawn
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The default, \code{NA}, corresponds to \code{1} for tick labels drawn
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\emph{parallel} to the axis and \code{0.25} otherwise, i.e., the
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\emph{parallel} to the axis and \code{0.25} otherwise, i.e., the
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default is equivalent to \preformatted{ perpendicular <- function(side, las) {
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default is equivalent to \preformatted{ perpendicular <- function(side, las) {
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is.x <- (side \%\% 2 == 1) # is horizontal x-axis
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is.x <- (side \%\% 2 == 1) # is horizontal x-axis
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( is.x && (las \%in\% 2:3)) ||
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( is.x && (las \%in\% 2:3)) ||
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(!is.x && (las \%in\% 1:2))
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(!is.x && (las \%in\% 1:2))
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}
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}
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gap.axis <- if(perpendicular(side, las)) 0.25 else 1}
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gap.axis <- if(perpendicular(side, las)) 0.25 else 1}% end{pre..}
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\code{gap.axis} may typically be relevant when \code{at = ..}
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tick-mark positions are specified explicitly.
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}
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}
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\item{\dots}{other \link{graphical parameters} may also be passed as
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\item{\dots}{other \link{graphical parameters} may also be passed as
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arguments to this function, particularly, \code{cex.axis}, \code{col.axis}
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arguments to this function, particularly, \code{cex.axis}, \code{col.axis}
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and \code{font.axis} for axis annotation, i.e. tick labels, \code{mgp}
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and \code{font.axis} for axis annotation, i.e. tick labels, \code{mgp}
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and \code{xaxp} or \code{yaxp} for positioning, \code{tck} or
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and \code{xaxp} or \code{yaxp} for positioning, \code{tck} or
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