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\usage{
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\usage{
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grid(nx = NULL, ny = nx, col = "lightgray", lty = "dotted",
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grid(nx = NULL, ny = nx, col = "lightgray", lty = "dotted",
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     lwd = par("lwd"), equilogs = TRUE)
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     lwd = par("lwd"), equilogs = TRUE)
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}
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}
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\arguments{
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\arguments{
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  \item{nx,ny}{number of cells of the grid in x and y direction.  When
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  \item{nx, ny}{number of cells of the grid in x and y direction.  When
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    \code{NULL}, as per default, the grid aligns with the tick marks on
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    \code{NULL}, as per default, the grid aligns with the tick marks on
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    the corresponding \emph{default} axis (i.e., tickmarks as computed by
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    the corresponding \emph{default} axis (i.e., tickmarks as computed by
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    \code{\link{axTicks}}).  When \code{\link{NA}}, no grid lines are
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    \code{\link{axTicks}}).  When \code{\link{NA}}, no grid lines are
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    drawn in the corresponding direction.}
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    drawn in the corresponding direction.}
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  \item{col}{character or (integer) numeric; color of the grid lines.}
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  \item{col}{character or (integer) numeric; color of the grid lines.}
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}
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}
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\examples{
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\examples{
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plot(1:3)
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plot(1:3)
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grid(NA, 5, lwd = 2) # grid only in y-direction
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grid(NA, 5, lwd = 2) # grid only in y-direction
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## maybe change the desired number of tick marks:  par(lab = c(mx,my,7))
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## maybe change the desired number of tick marks:  par(lab = c(mx, my, 7))
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op <- par(mfcol = 1:2)
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op <- par(mfcol = 1:2)
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with(iris,
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with(iris,
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     {
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     {
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     plot(Sepal.Length, Sepal.Width, col = as.integer(Species),
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     plot(Sepal.Length, Sepal.Width, col = as.integer(Species),
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          xlim = c(4, 8), ylim = c(2, 4.5), panel.first = grid(),
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          xlim = c(4, 8), ylim = c(2, 4.5), panel.first = grid(),
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          main = "with(iris,  plot(...., panel.first = grid(), ..) )")
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          main = "with(iris,  plot(...., panel.first = grid(), ..) )")
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     plot(Sepal.Length, Sepal.Width, col = as.integer(Species),
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     plot(Sepal.Length, Sepal.Width, col = as.integer(Species),
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          panel.first = grid(3, lty = 1,lwd = 2),
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          panel.first = grid(3, lty = 1, lwd = 2),
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          main = "... panel.first = grid(3, lty = 1,lwd = 2), ..")
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          main = "... panel.first = grid(3, lty = 1, lwd = 2), ..")
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     }
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     }
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    )
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    )
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par(op)
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par(op)
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}
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}