Remove whitespace between margins when using grid graphics

[scott_chamberlain]

Hello,


I have seen some tips on how to adjust margins of ggplot graphics
(plot.margin in opts), but is there a way to simply remove whitespace
between plots?

Consider the following example:

require(ggplot2)

a <- qplot(a, b, data = data.frame(a=rnorm(20), b=rnorm(20)), geom =
"point") +
opts(axis.text.x = theme_blank()) +
labs(x="")
b <- qplot(a, b, data = data.frame(a=rnorm(20), b=rnorm(20)), geom =
"point")

pdf("plot.pdf")
grid.newpage()
pushViewport(viewport(layout = grid.layout(2,2)))
vplayout <- function(x, y)
viewport(layout.pos.row = x, layout.pos.col = y)
print(a, vp = vplayout(1, 1))
print(b, vp = vplayout(2, 1))
print(a, vp = vplayout(1, 2))
print(b, vp = vplayout(2, 2))
dev.off()



I want to easily remove most of the whitespace between the upper two
plots and the lower two plots (or between left and right hand plots)
without having to adjust margins of all the plots using plot.margin).

Thanks! Scott

[Dennis Murphy]

Hi:

Here's one way, playing around with the positions of viewports in
grid. I also stripped out the plot.background().

a <- qplot(a, b, data = data.frame(a=rnorm(20), b=rnorm(20)),
geom = "point") +

opts(axis.text.x = theme_blank(), plot.background = theme_blank()) +

labs(x="")
b <- qplot(a, b, data = data.frame(a=rnorm(20), b=rnorm(20)),

geom = "point") + opts(plot.background = theme_blank())

vp1 <- viewport(width = 0.54, height = 0.54, x = 0.27, y = 0.27)
vp2 <- viewport(width = 0.54, height = 0.54, x = 0.27, y = 0.75)
vp3 <- viewport(width = 0.54, height = 0.54, x = 0.76, y = 0.26)
vp4 <- viewport(width = 0.54, height = 0.54, x = 0.76, y = 0.75)

grid.newpage()
pushViewport(viewport(layout = grid.layout(2,2)))
print(b, vp = vp1)
print(a, vp = vp2)
print(b, vp = vp3)
print(a, vp = vp4)

You can play around with the widths and heights to control the size of
a viewport; x and y define the center position of the viewport.

HTH,
Dennis

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[Scott Chamberlain]

Dennis, 

Genius. Thanks a lot. 

Apologies; I should have thought to mess with the viewport options. 

Scott