Lattice: multiple plots in one window?

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The ‘lattice’ package is built on the grid package and attaches its namespace when ‘lattice’ loaded. However, in order to use the grid.layout function, you need to explicitly load() pkg::grid. The other alternative, that is probably easier, is the grid.arrange function in pkg::gridExtra:

 install.packages("gridExtra")
 require(gridExtra) # also loads grid
 require(lattice)
 x <- seq(pi/4, 5 * pi, length.out = 100)
 y <- seq(pi/4, 5 * pi, length.out = 100)
 r <- as.vector(sqrt(outer(x^2, y^2, "+")))

 grid <- expand.grid(x=x, y=y)
 grid$z <- cos(r^2) * exp(-r/(pi^3))
 plot1 <- levelplot(z~x*y, grid, cuts = 50, scales=list(log="e"), xlab="",
           ylab="", main="Weird Function", sub="with log scales",
           colorkey = FALSE, region = TRUE)

 plot2 <- levelplot(z~x*y, grid, cuts = 50, scales=list(log="e"), xlab="",
           ylab="", main="Weird Function", sub="with log scales",
           colorkey = FALSE, region = TRUE)
 grid.arrange(plot1,plot2, ncol=2)

enter image description here

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