ggplot: Showing x-axis line for each facet plot

Question

I have created a facet plot using ggplot which has 4 rows and 1 column with this code: ``` ggplot(data=c, aes(x=Time, y=X.mean, fill = Site, width=.1)) + geom_bar(stat="identity", position=position_dodge(), width=0.5,colour="black", show_guide=FALSE) + ylab(NULL) + xlab(NULL) + geom_errorbar(aes(ymax= X.Passes.sd, ymin= 0), size = 0.7, width = 0.3,position = position_dodge(0.9))+ scale_fill_manual(values=c("cadetblue2", "royalblue1", "mediumseagreen", "green4")) + scale_y_continuous(breaks=number_ticks(12), expand = c(0, 0), limits=c(0,20)) + scale_x_discrete(expand = c(0, 0), limits=c("17:00","18:00","19:00","20:00","21:00","22:00","23:00","00:00","01:00","02:00","03:00","04:00", "05:00", "06:00")) + facet_wrap(~ Site, ncol=1,nrow=4)+ theme_bw() + theme(strip.text.x = element_text(size=18))+ theme(axis.title.y=element_text(size = 18)) + theme(panel.grid.minor=element_blank(), panel.grid.major=element_blank())+ theme(axis.text.x=element_text(angle = 45, hjust=1, vjust=1, size = 18))+…

Accepted Answer

You might have found a solution already, but I've always just included the line `geom_hline(yintercept=0)` to add the x-axis origin line to my plots. Its a serious hack, but it also provides you some aesthetic control, and I haven't found a better work around.

ggplot: Showing x-axis line for each facet plot

Solution

Problem