R help - Nov 2002 - Putting value labels inside the bars of a bar plot

I'd like to label a bar plot with the actual value of each bar, inside the
bar. I see that there are ways to plot arbitrary text, so I could do it
'manually', but this seems common enough that there's probably a
simple
solution. I don't see it in the high-level documentation for barplot, and
haven't found it anywhere yet. How might this be done?

Thanks,
Tom

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Hi


Tom Arnold wrote:
> 
> I'd like to label a bar plot with the actual value of each bar, inside
the
> bar. I see that there are ways to plot arbitrary text, so I could do it
> 'manually', but this seems common enough that there's probably
a simple
> solution. I don't see it in the high-level documentation for barplot,
and
> haven't found it anywhere yet. How might this be done?

The trick is to know that barplot returns the x-location of the
midpoints of the bars.  Here's a simple example:

	x <- sample(seq(15, 30, 5))
	midpoints <- barplot(x)
	text(midpoints, 3, labels=x)

Paul
-- 
Dr Paul Murrell
Department of Statistics
The University of Auckland
Private Bag 92019
Auckland
New Zealand
64 9 3737599 x5392
paul at stat.auckland.ac.nz
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Try something like:
> bar.center <- barplot(x)
> text(bar.center, x, x)
Adjust second argument to text() to get the labels where you want them.
Look at the "Value" section of the "barplot" help page.

HTH,
Andy

-----Original Message-----
From: Tom Arnold [mailto:tarnold at smpllc.com]
Sent: Wednesday, November 13, 2002 6:22 PM
To: R-Help
Subject: [R] Putting value labels inside the bars of a bar plot


I'd like to label a bar plot with the actual value of each bar, inside the
bar. I see that there are ways to plot arbitrary text, so I could do it
'manually', but this seems common enough that there's probably a
simple
solution. I don't see it in the high-level documentation for barplot, and
haven't found it anywhere yet. How might this be done?

Thanks,
Tom

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