R數據可視化圖例

源代碼： dose <- c(20, 30, 40, 45, 60) drugA <- c(16, 20, 27, 40, 60) drugB <- c(15, 18, 25, 31, 40) opar <- par(no.readonly = TRUE) par(lwd = 2, cex = 1.5, font.lab = 2) plot(dose, drugA, type = "b",

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