Hello, Robert,
see hints below.
On Tue, 21 Dec 2010, Robert Ruser wrote:
Hello,
I'm wondering how to set a value of mar ( par( mar=c(.......)) ) in
order to allow labels to be visible in barplot. Is there any relation
between the number of characters in a label and the second value of
mar? Look at my example.
x <- seq(20, 100, by=15)
ety <- rep( "Effect on treatment group", times=length(x))
barplot(x, names.arg=ety, las=1, horiz=TRUE)
Labels are not visible. But trial and error method with the second mar
argument I get what I want.
par(mar=c(3,12,2,1), cex=0.8)
barplot(x, names.arg=ety, las=1, horiz=TRUE)
I would like something like that: second.mar = max( nchar(ety) )/2
Can't help with that really, but ...
Taking the opportunity I have 2 another question:
1. Space between labels and bars is too big - how to change it to the
value of 1 character?
2. In the example above the x axis is too short. How to make R draw a
line little longer then maximum bar length. I know that I could set
xlim=c(0,max(x)) but because of main increase equals 20 and the last
value 95 it doesn't solve the problem. The increase is ok. but only
line should be longer.
You could take a look at par()'s argument mgp, but it affects both axes at
the same time. I have the impression that you want more control of the
style of each axis separately; axis() might than be useful, like
par( mar = c( 3, 13, 2, 1), cex = 0.8)
barplot( x, names.arg = NULL, horiz = TRUE, axes = FALSE)
axis( side = 1, at = c( seq( 0, 80, by = 20), 95))
axis( side = 2, at = 1:length(ety), line = -1, las = 1, tick = FALSE,
labels = ety)
Hth,
Gerrit
Thank you
Robert
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