R help - Sep 2009 - axis: forcing last label to print

Hello,

I often use the axis command to add labels to axes with large numbers of
consecutively numbered names:

y<- barplot (x, log="x")
axis(1, at = y, labels = c(1:12345))

Since there are more labels than will fit in the space, the command only
prints selected labels.  This is what I want, except that it never actually
prints a label for the final item.  Thus I end up with labels something like
this:

1  16  123  1432  2134  3235  6578  11385

when I really want the last label displayed to be the final category number
(12345):

1  16  123  1432  2134  3235  6578   12345

Short of manually choosing the labels, does anyone know a way to force the
last category to be among those printed when axis selects labels?

Thanks,
Shawn Polson

Delaware Biotechnology Institute
University of Delaware
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On 09/20/2009 02:12 PM, Shawn Polson wrote:
> Hello,
>
> I often use the axis command to add labels to axes with large numbers of
> consecutively numbered names:
>
> y<- barplot (x, log="x")
> axis(1, at = y, labels = c(1:12345))
>
> Since there are more labels than will fit in the space, the command only
> prints selected labels.  This is what I want, except that it never actually
> prints a label for the final item.  Thus I end up with labels something
like
> this:
>
> 1  16  123  1432  2134  3235  6578  11385
>
> when I really want the last label displayed to be the final category number
> (12345):
>
> 1  16  123  1432  2134  3235  6578   12345
>
> Short of manually choosing the labels, does anyone know a way to force the
> last category to be among those printed when axis selects labels?
>
>    
Hi Shawn,
You can get the first and last label with:

axis(1,seq(1,12345,length.out=8)

but you have to specify how many labels you want, and you will get 
non-integer labels unless the upper limit divides evenly.

Jim