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\usage{
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\usage{
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grid.function(...)
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grid.function(...)
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functionGrob(f, n = 101, range = "x", units = "native",
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functionGrob(f, n = 101, range = "x", units = "native",
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             name = NULL, gp=gpar(), vp = NULL)
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             name = NULL, gp=gpar(), vp = NULL)
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grid.abline(intercept, slope, ...)
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grid.abline(intercept, slope, ...)
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}
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}
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\arguments{
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\arguments{
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  \item{f}{ A function that must take a single argument
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  \item{f}{ A function that must take a single argument
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    and return a list with two numeric components named \code{x} and
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    and return a list with two numeric components named \code{x} and
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    \code{y}.}
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    \code{y}.}
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\details{
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\details{
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  \code{n} values are generated and passed to the function \code{f}
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  \code{n} values are generated and passed to the function \code{f}
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  and a series of lines are
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  and a series of lines are
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  drawn through the resulting \code{x} and \code{y} values.
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  drawn through the resulting \code{x} and \code{y} values.
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  The generation of the \code{n} values depends on the value of
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  The generation of the \code{n} values depends on the value of
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  \code{range}.  In the default case, \code{dim} is
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  \code{range}.  In the default case, \code{dim} is
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  \code{"x"}, which means that a set
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  \code{"x"}, which means that a set
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  of \code{x} values are generated covering the range of the current
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  of \code{x} values are generated covering the range of the current
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  viewport scale in the x-dimension.  If \code{dim} is \code{"y"}
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  viewport scale in the x-dimension.  If \code{dim} is \code{"y"}
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  then values are generated from the current y-scale instead.
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  then values are generated from the current y-scale instead.