geom_point(aes(x=1,y=1))+ labs(title=expression(R^2==0.56))+ theme(plot.title = element_text(hjust=0.5), plot.margin = unit(c(1,4,1,1),"lines")) image.png 四个位置 控制的分别是上右下 左 数据分组排序 > df<-data.frame(group=c("A","A","A","B","B","B"), + valu...