[R] Adding margin text to lattice graphics

baptiste auguie baptiste.auguie at googlemail.com
Sun Apr 10 03:45:10 CEST 2011


You may want to read about ?viewport in the grid package. They allow
you to position graphical elements wherever you want on a page, such
as lattice plots and text (grid.text). For a high-level interface, you
could try the following,


p1 = xyplot(1~1)
p2 = levelplot(volcano)
p3 = tableGrob(head(mpg[, 1:3]))
p4 = textGrob("some text")

grid.arrange(p1, p2, p3, p4, main="global page title",
                    sub=p4, left="page y-label")


On 10 April 2011 13:33, Dennis Fisher <fisher at plessthan.com> wrote:
> Colleagues
> I am learning lattice graphics (R 2.12.2; OS X).  Several days ago, I inquired about adding margin text to lattice graphics.  Jim Price offered a useful reply, suggesting that I add:
>        page = function(page) grid.text('words', x = 0.5, y = 0.01)
> to my call to the function.  The entire function that he suggested was;
>        xyplot(1 ~ 1,
>         par.settings = list(layout.heights = list(bottom.padding = 10)),
>         page = function(page) grid.text('words', x = 0.5, y = 0.01))
> That worked initially and I also had success with panel.text.
> However, I am now working with more complicated objects in which more than one image is displayed on a page.  In this instance, the text added by the command above appears with each image.  I would like it to appear only once, scaled across the entire page, not relative to a single panel.
> Is there a different command that accomplishes my goal?  Or a different implementation of this same command?  Any help would be greatly appreciated.
> Also, because of my naivete with lattice graphics, I may be asking the question in entirely the wrong way -- please feel free to redirect me.
> Dennis
> Dennis Fisher MD
> P < (The "P Less Than" Company)
> Phone: 1-866-PLessThan (1-866-753-7784)
> Fax: 1-866-PLessThan (1-866-753-7784)
> www.PLessThan.com
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