How to plot grid plots on a same page?

Question

I am using a package (treemap) that uses grid package to produce a treemap. However, I would like to plot several of these treemaps together, to ad

Answer 1

Thanks for your question. The output of tmPlot is indeed not a saved plot.

In the next update I will add argument vp, by which a viewport can be specified to draw in. Only if it is not specified, grid.newpage is called.

UPDATE: You could check and test the development version at https://github.com/mtennekes/treemap

To apply the example of Bryan Hanson:

vplayout <- function(x, y) viewport(layout.pos.row = x, layout.pos.col = y)
grid.newpage()
pushViewport(viewport(layout = grid.layout(1, 2)))
tmPlot(GNI2010,
  index="continent",
  vSize="population",
  vColor="GNI",
  type="value",
  vp = vplayout(1,1))
tmPlot(GNI2010,
  index=c("continent", "iso3"),
  vSize="population",
  vColor="GNI",
  type="value",
  vp = vplayout(1,2))