[R] barplot and x-axis font size

[Jim Lemon]

On 08/04/2010 05:38 PM, Roslina Zakaria wrote:
> Hi all,
>
> I would like to draw a side by side bar plot.  How can I adjust the the font
> size for the x-axis?  Furthermore, I'm not sure what to write for 'at=?'.  I
> tried cex.axis and cex.lab but still fail.  Here is my data and code:
>
>> t(all)
>             0-100 100-150  150-200 200-250 250-300 300-350 350-400 400-620
> obs_data 382.000 177.000 156.0000    93.0 69.0000  45.000 14.0000 15.0000
> pre_gam  364.233 195.906 167.8515    95.1 63.2415  30.432 16.6425 17.5935
>
> bplt<- barplot(t(all), col=c("blue","yellow"),beside=TRUE,xlab="Rainfall (mm)",
>          ylab="Frequency", main="Observed and predicted, Dec-Feb
> Beec",ylim=c(0,400))
> legend("topright",c("observed","predicted"),fill=c("blue","yellow"))
> axis(1, at =? , lab =
> c("0-100","100-150","150-200","200-250","250-300","300-350","350-400","400-620"),
>   cex.axis = 0.5)
>
Hi Rosalina,
As Ivan said, you will first have to suppress the x axis in the initial 
barplot. The return value of a barplot is the positions of the centers 
of the bars, so:

axis(1,at=bplt,...)

Jim