ggplot2调整X轴标签顺序

Create test data group = c(rep("A", 3), rep("B", 6), rep("C", 5),rep("D", 4)) value<-c(rnorm(3,mean=1,sd=4),rnorm(6,mean=0,sd=1),rnorm(5,mean=2,sd=2),rnorm(4,mean=5,sd=1)) tt.data<-data.frame(group,va

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