ggplot2の軸とかに数式を使いたい
expression
使えばよろし。
library("mmetrics") df <- gsummarise(iris, Species, metrics = define(y=sum(Petal.Width))) ggplot(df, aes(x = Species, y = y)) + geom_bar(position = "dodge", color="black", stat="identity") + labs(x = expression(alpha["100"]), y=expression(paste(rho["1"], ", ", rho["2"])))