How to solve the 'ymax not defined'?

Question

I'm trying to create a geom_bar with:

<<boring-plots, fig.width=5, fig.height=5, out.width='.45\\linewidth',fig.show='hold', echo=FALSE, warning=FALSE>>=
ma_at_vs_t_duh + geom_bar(stat="bin", fill="white", colour="darkgreen", width=.4)     + ggtitle("Anzahl MA nach Vertragsart, \nMandant 10 und 50") + 
theme(plot.title = element_text(lineheight=.6, face="bold")) + 
xlab("Vertragsart") + 
ylab("Anzahl MA") + 
theme(axis.title.x = element_text(vjust=0.5, size=14), axis.text.x=element_text(size=10)) +
stat_bin(aes(label=..count..), geom="text", size=4, vjust=-0.5) 
@

After compiling the Rnw-File I'm getting in the pdf-output file:

ymax not defined: adjusting position using y instead

I'd appreciate any help. thanks!

Answer 1

If anyone is still interested in this, you can add ymax = max(value), in the aes of ggplot, and that will make the 'ymax not defined' warning to go away.

Since ymax is used to define the max 'height' of a barplot for example, I would recommend to set to a bit more than the maximum value of your data in the y axis.

Something like this:

ggplot(df,aes(x=bla,y=blu,ymax=max(blu)*1.05))+geom_bar() 

Multiplying by 1.05 gives you 5% breathing room for annotation.