X = c(1, 3, 5, 7), Y = c(3, 9, 4, 2)) g <- ggplot(data = dat) + aes(x = X, y = Y) + geom_path() + geom_point(mapping = aes(color = tag)) HHQMPUը૾ͷอଘ ggsave(filename = "fig/demo01.png", plot = g, width = 10, height = 7.5, dpi = 150, units = "cm") # "cm", "mm", "in"を指定可能