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The following script

require(ggplot2)
require(gridExtra)

grid_arrange_shared_legend <- function(plots) {
  g <- ggplotGrob(plots[[1]] + theme(legend.position="bottom"))$grobs
  legend <- g[[which(sapply(g, function(x) x$name) == "guide-box")]]
  lheight <- sum(legend$height)
  grid.arrange(arrangeGrob(grobs=lapply(plots, function(x)
    x + theme(legend.position="none")),ncol = 3),
    legend,
    ncol = 1,
    heights = unit.c(unit(1, "npc") - lheight, lheight))
}
plotList <- list()
df <- data.frame(value=rnorm(10))

for (i in 1:12){
  plotList[[i]] <- qplot(Sepal.Length, Petal.Length, data = iris, color = Species)
}
pdf("plots.pdf",width=12.21/2.54, height=20.92/2.54)
grid_arrange_shared_legend(plotList)
dev.off()

Results in a two page pdf. The first page is empty. The second page contains the desired grid of plots.

Why is the first page empty and how do I get rid of it?

Jaap
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Julian Karch
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1 Answers1

1

I'm not sure why the first page is empty. But setting onefile = FALSE in pdf solves the issue.

pdf("plots.pdf",width=12.21/2.54, height=20.92/2.54,onefile=FALSE)

There is another question in Stack Overflow related to this issue. In R, how to prevent blank page in pdf when using gridBase to embed subplot inside plot

Community
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Haritha Elango
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