bugs in ggplot2 book

[Wincent]

In the last chapter, there are such codes (http://had.co.nz/ggplot2/
book/grid.r)

p <- qplot(wt, mpg, data=mtcars, colour=cyl)
# Get the plot grob
grob <- ggplotGrob(p)
# Modify in place
grob <- geditGrob(grob, gPath("strip","label"), gp=gpar
(fontface="bold"))

# Draw it
grid.newpage()
grid.draw(grob)

After modification of grob, it becomes NULL, which is obviously a
mistake, right?

[hadley wickham]

Hi Wincent,

Wow, that's a terrible example, but it illustrates that geditGrob will
return NULL if it can't find the named grob (I'm pretty sure I
complained to Paul about this but I forgot what the outcome was).

A better illustration is

p <- qplot(wt, mpg, data=mtcars, colour=cyl)

grob <- ggplotGrob(p)
grob2 <- geditGrob(grob, gPath("legend.text"), gp=gpar(fontface = "bold"))

grid.newpage()
grid.draw(grob2)

I'll add this to the book errata.

Hadley

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