I am using ggplot2 to draw a heat map, but when the time variable is used as the horizontal axis, there is always a white gap as shown in the figure below. I have tried various methods but cannot delete it.
I earnestly request your guidance, thank you.
plotda <- xd[dtime<=as.Date('1962-3-1'),] ggplot(plotda,aes(x=dtime,y=station,fill=severity))+ geom_tile()+ facet_grid(group~. )+ scale_x_date(expand=expansion(mult=0,add=0),minor_breaks=NULL,date_labels='%Y%m')