[R] Alignment of x-axis labels

[Peter Ehlers]

On 2010-04-15 7:23, Steve Murray wrote:
>
> Dear all,
>
> I'm having trouble getting the correct spacing between x-axis labels on a barplot. This is the command I'm using to generate the plot:
>
> temp<- barplot(precip, beside=TRUE, xaxt="n", las=1, xpd=FALSE, col="grey28", ylim=c(0, max(precip)))
>
> Here is the structure of temp:
>> str(temp)
>   num [1:96, 1] 0.7 1.9 3.1 4.3 5.5 6.7 7.9 9.1 10.3 11.5 ...
>
> And here is the structure of the data being plotted:
>> str(precip)
>   num [1:96] 1841 2871 9254 22335 30682 ...
>
>> length(precip)
> [1] 96
>
> These are monthly data points for 8 years (8 * 12 = 96), but I only want to have labels for each year (1978 to 1985), rather than every month. So I tried using the following command, but this results in the labels not being far enough apart, and therefore they don't fill the length of the x-axis (and don't align properly with the corresponding first bar of every year):
>
> axis(1, at=seq(1,96,12), 1978:1985)

Your seq() needs to index the elements of temp.
Something like

  axis(1, at = temp[seq(...)], ...)

  -Peter Ehlers

>
>
> This one has stumped me somewhat, so I'd be grateful to receive any suggestions as to how I might resolve this.
>
> Many thanks,
>
> Steve
>   		 	   		
> _________________________________________________________________
>
> We want to hear all your funny, exciting and crazy Hotmail stories. Tell us now
> ______________________________________________
> 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.
>
>

-- 
Peter Ehlers
University of Calgary