Okay, I misread what you wanted. Try this ====================================================== x <- 4:7 positions <- barplot(x) mid <- x/2 arrows(positions-.5,mid,positions+.5,mid,angle=0) ====================================================== --- On Thu, 9/9/10, Steve Murray <smurray...@hotmail.com> wrote:
> From: Steve Murray <smurray...@hotmail.com> > Subject: RE: [R] Alignment of lines within barplot bars > To: jrkrid...@yahoo.ca, r-help@r-project.org > Received: Thursday, September 9, 2010, 1:19 PM > > Thanks for the reply. > > However this isn't quite what I want. I'm looking to > display a single horizontal line across each bar - the > distance up the y-axis corresponding to the values of the > object horiz_values. > > So unless there's a way of controlling where the argument > 'density' plots a particular line, then I don't think this > is what I'm looking for. > > Any other suggestions are very welcome. > > Thanks again, > > Steve > > > ---------------------------------------- > > Date: Thu, 9 Sep 2010 10:01:26 -0700 > > From: jrkrid...@yahoo.ca > > Subject: Re: [R] Alignment of lines within barplot > bars > > To: r-help@r-project.org; > smurray...@hotmail.com > > > > Like this? > > > > x <- 4:7 > > barplot(x, density=10, angle=180) > > > > > > > > --- On Thu, 9/9/10, Steve Murray wrote: > > > >> From: Steve Murray > >> Subject: [R] Alignment of lines within barplot > bars > >> To: r-help@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 > >> > >> > >> > >> > >> > >> ______________________________________________ > >> R-help@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. > >> > > > > > > > > ______________________________________________ R-help@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.