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並前往https://www.datanovia.com/en/blog/how-to-subset-a-dataset-when-plotting-with-ggplot2/

How to Subset a Dataset When Plotting with GGPLOT2

df <- data.frame( supp = rep(c("VC", "OJ"), each = 3), dose = rep(c("D0.5", "D1", "D2"), 2), len = c(6.8, 15, 33, 4.2, 10, 29.5) ) head(df)

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