[R] add information above bars of a barplot()

[William Dunlap]

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of William Dunlap
> Sent: Monday, March 22, 2010 9:31 AM
> To: Martin Batholdy; r help
> Subject: Re: [R] add information above bars of a barplot()
> 
> > -----Original Message-----
> > From: r-help-bounces at r-project.org 
> > [mailto:r-help-bounces at r-project.org] On Behalf Of Martin Batholdy
> > Sent: Monday, March 22, 2010 7:53 AM
> > To: r help
> > Subject: [R] add information above bars of a barplot()
> > 
> > hi,
> > 
> > 
> > I have a barplot with six clusters of four bars each.
> > Now I would like to add the exact value of each bar as a 
> > number above the bar.
> > 
> > I hoped to get some tips here.
> > I could simply add text at the different positions, but I 
> > don't understand how the margins on the x-axis are calculated
> > (how can I get / calculate the x-ticks of a barplot?).
> > 
> > Also I would like to code this flexible enough so that it 
> > still works when I have more bars in each cluster.
> 
> You didn't say how you made the original barplot, but
> here is one way use barplot()'s return value (the
> x coordinates of the bar centers) to add text a little
> above the top of each bar:
> 
>   z <- rbind(log2(1:10), sqrt(1:10), (1:10)/3) # data matrix
>   barX <- barplot(z, beside=TRUE)
>   text(cex=.5, x=barX, y=z+par("cxy")[2]/2, round(z,2), xpd=TRUE)
> 
> The xpd=TRUE means to not plot the text even if it is outside
                        ^^^^^^^^ : I meant either "not clip" or "plot"
> of the plot area and par("cxy") gives the size of a typical
> character in the current user coordinate system.
> 
> Bill Dunlap
> Spotfire, TIBCO Software
> wdunlap tibco.com 
> 
> > 
> > 
> > 
> > thanks for any suggestions!
> > 
> > ______________________________________________
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> > 
> 
> ______________________________________________
> R-help at r-project.org mailing list
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> PLEASE do read the posting guide 
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>