Is there any way to see the range of the graph created by ggplot?

[Miao]

 

p<-ggplot(…….)

 

If xlim and ylim are not set with the ggplot function, then the range of the graph is determined automatically by ggplot. Is there any way to see the range of the graph?

 

Range <- somefunction(p)

Or

Range <-p$.....  ?

[Dennis Murphy]

Here's an example using a data frame I picked up from another thread
somewhere. To keep it simple, let's just do a scatterplot and find the
bounds of the x- and y-scales in the original coordinate system. The
.05 offsets come from the default value of the expand = argument in
both scale_x_continuous() and scale_y_continuous().

DF <- structure(list(x = c(43, 22, 53, 21, 13, 53, 23, 12, 32), y = c(42,
65, 23, 45, 12, 22, 54, 32, 12)), .Names = c("x", "y"), row.names = c(NA,
-9L), class = "data.frame")

p <- ggplot(DF, aes(x = x, y = y)) + geom_point()
pp <- ggplot_build(p)

> pp$panel$ranges[[1]]$x.range
[1] 9.95 55.05
> pp$panel$ranges[[1]]$y.range
[1] 9.35 67.65

To see how I found this, start with

str(pp)
str(pp$panel)
str(pp$panel$ranges)

and go from there.

Dennis

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