lines with = unit(0,"null") don't work anymore in gggplot2 0.9.2

[Roey Angel]

Hi!
I often use the following handy function to eliminate all background elements and have a whit background (copied it from somewhere on the internet):

opts_fullframe = function() {
  structure(list(panel.background = theme_blank(),
                 panel.grid.major = theme_blank(),
                 panel.grid.minor = theme_blank(),
                 panel.margin = unit(0,"null"),
                 plot.margin = rep(unit(0,"null"),4),
                 axis.ticks = theme_blank(),
                 axis.text.x = theme_blank(),
                 axis.text.y = theme_blank(),
                 axis.title.x = theme_blank(),
                 axis.title.y = theme_blank(),
                 axis.ticks.length = unit(0,"null"),
                 axis.ticks.margin = unit(0,"null")), class = "options")
}

As of ggplot2 0.9.2 this no longer works (gives error:

Error in p + o : non-numeric argument to binary operator

In addition: Warning message:
Incompatible methods ("+.gg", "Ops.unit") for "+" )

Some debugging led me to realize that it's the lines with = unit(0,"null") which cause the problem.
What's the replacement for this in 0.9.2?

Thanks in advance,
Roey

p.s.
I know theme_blank() should also be replaced with element_blank().

[Ben Bolker]

Did you remember library("grid") ?
(That might not be the problem but it's my first guess.)

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[Roey Angel]

Thanks for the reply Ben but this doesn't seem to be it.
grid wasn't loaded but even after loading it the problem persists.

Roey

[Roey Angel]

Correction. It seems the problem isn't (unit(0,"null")at all but rather with the change of object class from "options" to whatever it is (maybe "theme).
This seems to solve the problem:

blankground <- function() {
    theme(panel.background = element_blank(),
          panel.grid.major = element_blank(),
          panel.grid.minor = element_blank(),

          panel.margin = unit(0,"null"),
          plot.margin = rep(unit(0,"null"),4),

          axis.ticks = element_blank(),
          axis.text.x = element_blank(),
          axis.text.y = element_blank(),
          axis.title.x = element_blank(),
          axis.title.y = element_blank(),
          axis.ticks = element_blank()
          )

  }

Roey

On Saturday, September 15, 2012 8:47:30 PM UTC+2, Roey Angel wrote: