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: [EMAIL PROTECTED] on behalf of Tom Hopper
Sent: Sun 11/16/2003 9:26 PM
To: [EMAIL PROTECTED]
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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