r - 使用scale_size_area(ggplot2)将 "0"大小的点绘制为完全不存在

Question

我正在尝试按簇绘制条件的气泡图，其中每个气泡的大小由第三个“百分比”变量设置。作为per the ggplot2 documentation，我认为我应该能够通过scale_size_area做到这一点。我不清楚为什么这行不通，并且当％= 0时，我仍然看到很小的一点。 (如果我误会了，我也希望能找到一种解决方法。在我的真实数据中，区分0和非常接近0很重要。)

ex <- data.frame(Condition=rep(c("ex1","ex2","ex3","ex4"),4),
                 Cluster=c(rep(1,4),rep(2,4),rep(3,4),rep(4,4)),
             Percent=c(0,0,0,1,0.25,0,0.25,0.5,1,0,0,0,0.25,0.25,0.25,0.25))
ggplot(ex, aes(Cluster, Condition, size=Percent))+ 
           geom_point(color = "blue")+ scale_size_area(max_size=20)

Answer 1

尝试

library(ggplot2)
ex <- data.frame(Condition=rep(c("ex1","ex2","ex3","ex4"),4),
                 Cluster=c(rep(1,4),rep(2,4),rep(3,4),rep(4,4)),
             Percent=c(0,0,0,1,0.25,0,0.25,0.5,1,0,0,0,0.25,0.25,0.25,0.25))
ggplot(ex, aes(Cluster, Condition, size=ifelse(Percent==0, NA, Percent))))+ 
           geom_point(color = "blue")+ scale_size_area(max_size=20)

使用 size=ifelse(Percent==0, NA, Percent))而不是 size=Percent将那些点从图形中排除。