[R] Newbie: Barchart Gray with White Grid?

[Adaikalavan RAMASAMY]

The examples in help(hist) and help(barplot) uses the argument col='gray' etc to set the color of the barplots/histograms. As for grids, the following may help
 
tN <- table(Ni <- rpois(100, lambda=5))
r <- barplot(tN, col="gray", xaxt="n")          # alternatively  hist(Ni, col="gray", freq=T)
abline( h=seq(0,max(tN), by=5), col="white" )

To turn off the numeric labels, use xaxt="n" option in the plot() command. You can try to set the background using the bg="blue". This and more options are documented in par().
 
 
-----Original Message----- 
From: r-help-bounces at stat.math.ethz.ch on behalf of Tom Hopper 
Sent: Sun 11/16/2003 9:26 PM 
To: r-help at stat.math.ethz.ch 
Cc: 
Subject: [R] Newbie: Barchart Gray with White Grid?



	Hello,
	
	I'm just getting in to R, been reading manuals (thanks to all who
	provided pointers to good docs!), and messing with different commands.
	I'd appreciate a little help with this exploration, and I hope that my
	question is relatively easy to answer (probably, there's a simple way
	to do what I'm working toward).
	
	R's statistical functions are coming along easily enough, but graphics
	seem to be a little tougher for me, probably because I'm used to
	working in SigmaPlot. As an exercise, I tried to create a gray bar
	chart with white grid overlay, like the one on page 128 of Tufte's
	"Visual Display of Quantitative Information." I  figure this would
	cover a lot of the basic techniques that I'll need for "real" work. I
	got as far as having a gray bar chart (I was working within hist(),
	mostly) with white borders, white (on white background) axes, white
	grid *under* the bars, and both x- and y-axis labels (both the numeric
	or categorical label, and the axis titles...I don't quite remember the
	correct terms in R).
	
	I wasn't able to find a way to display only the gridlines parallel to
	the x-axis, or to overlay that grid on top of the bars, or to turn off
	the numeric labels on the x-axis without touching the y-axis, or to
	show the x-axis as a gray line without showing the y-axis.
	
	Has anyone done this? How?
	
	Thank you,
	
	Tom
	
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