[R] About graphics

[Duncan Murdoch]

On 05/02/2010 10:48 AM, Silvano wrote:
> Hi,
>
> I'm building a graph (barplot) in which the X axis label 
> disappears.
> I tried to use the option mgp of par() and I could not get 
> the desired result.
>
> Note that want the axis labels horizontally.
>
> caes = c(37,20,19,16,75,103)
> names(caes) = c("Pinscher", "Pastor \n Alemão", "Poodle", 
> "Rottweiller", "SRD", "Outros")
> caess = sort(caes, decreasing=F)
> par(mar=c(3, 5.7, 1, 1), mgp=c(4.5, .5, 0), las=1)
>   

You've set margin 1 too small.  The barplot() function puts the x axis 
label quite far from the plot, so you need something like

par(mar=c(6.1, 5.7, 1, 1), mgp=c(4.5, .5, 0), las=1)

to give room for it.  I think it would look better with the label 
closer, which you can do using

mtext("Frequências", side=1, line=3)

(and this would work with a smaller margin, but not as small as 3).  For 
example,

caes = c(37,20,19,16,75,103)
names(caes) = c("Pinscher", "Pastor \n Alemão", "Poodle",
"Rottweiller", "SRD", "Outros")
caess = sort(caes, decreasing=F)
par(mar=c(4.5, 5.7, 1, 1), mgp=c(4.5, .5, 0), las=1)
barplot(caess, cex.axis=1, cex.names=1, ylab="Raças dos Cães",
        xlab="", bty='l', col="LightYellow",
horiz=T, xlim=c(0,120))
mtext("Frequências",side=1, line=3)
abline(v=0)


> barplot(caess, cex.axis=1, cex.names=1, ylab="Raças dos 
> Cães",
>         xlab="Frequências", bty='l', col="LightYellow", 
> horiz=T, xlim=c(0,120))
> abline(v=0)
>
> Suggestions?
>
> --------------------------------------
> Silvano Cesar da Costa
> Departamento de Estatística
> Universidade Estadual de Londrina
> Fone: 3371-4346
>
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