[R] Alignment of lines within barplot bars

[John Kane]

Like this?

x <- 4:7
barplot(x, density=10, angle=180)



--- On Thu, 9/9/10, Steve Murray <smurray444 at hotmail.com> wrote:

> From: Steve Murray <smurray444 at hotmail.com>
> Subject: [R] Alignment of lines within barplot bars
> To: r-help at r-project.org
> Received: Thursday, September 9, 2010, 11:35 AM
> 
> Dear all,
> 
> I have a barplot upon which I hope to superimpose
> horizontal lines extending across the width of each bar. I
> am able to partly achieve this through the following set of
> commands:
> 
> positions <- barplot(bar_values, col="grey")
> par(new=TRUE)
> plot(positions, horiz_values, col="red", pch="_",
> ylim=c(min(bar_values), max(bar_values)))
> 
> 
> ...however this results in small, off-centred lines, which
> don't extend across the width of each bar. I've tried using
> 'cex' to increase the width, but of course this also
> increases the height of the line and results in it spanning
> a large range of y-axis values.
> 
> 
> I'm sure this shouldn't be too tricky to achieve, nor that
> uncommon a problem! It may be that I'm taking the wrong
> approach.
> 
> Any help offered would be gratefully received.
> 
> Many thanks,
> 
> Steve
> 
>     
>         
>           
>   
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