[R] labels and barchart

[Gerrit Eichner]

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
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.