grob

I have a faceted plot that forms an n x m grid. By design, the last (bottom-right) cell is always empty, so I'd like to utilize the extra space by adding another ggplot object. My current solution relies on low-level viewport approach, which is not very elegant and requires some hard-coding for position and size. Instead, I assume the empty space is reachable in some other fashion, probably with gridExtra ? Here's a minimal example for n=m=2 . Note that the edges are not aligned properly, so some extra work is required to manually adjust viewport's parameters, which is a pain, especially if (n

I have a function which manipulates a ggplot object, by converting it to a grob and then modifying the layers. I would like the function to return a ggplot object not a grob. Is there a simple way to convert a grob back to gg? The documentation on ggplotGrob is awfully sparse. Simple example: P <- ggplot(iris) + geom_bar(aes(x=Species, y=Petal.Width), stat="identity") G <- ggplotGrob(P) ... some manipulation to G ... ## DESIRED: P2 <- inverse_of_ggplotGrob(G) such that, we can continue to use basic ggplot syntax, ie `P2 + ylab ("The Width of the Petal")` UPDATE: To answer the question in the

corrplot plots a correlation matrix, but it does not return a graphical object (grob) I would like to plot several correlation matrices on a single page. For normal plots, I would use grid.arrange from the gridExtra package. However since corrplot only prints and does not return an object, I can't see how to do this. Is there a workaround or a better alternative to corrplot ? There's the old standby par(mfrow=c(x, y)) where x is the number of rows you wish to plot and y the numberof columns. It then posts across and then down as you call the plots. par(mfrow = c(2, 2)) corrplot(cor(mat1))

I am trying to reproduce the following [base R] plot with ggplot2 I have managed most of this, but what is currently baffling me is the placement of the line segments that join the marginal rug plot on the right of the plot with the respective label. The labels have been draw (in the second figure below) via anotation_custom() and I have used @baptiste's trick of turning off clipping to allow drawing in the plot margin. Despite many attempts I am unable to place segmentGrobs() at the desired locations in the device such that they join the correct rug tick and label. A reproducible example is y