在R中使用ggplot将单点添加到多线图中,可以按照以下步骤进行操作:
install.packages("ggplot2")
library(ggplot2)
df <- data.frame(x = c(1, 2, 3, 4, 5),
y1 = c(2, 4, 6, 8, 10),
y2 = c(3, 6, 9, 12, 15),
y3 = c(4, 8, 12, 16, 20))
p <- ggplot(data = df, aes(x = x, y = y1))
p <- p + geom_line(aes(y = y2))
p <- p + geom_line(aes(y = y3))
p <- p + geom_point(data = df[df$x == 3, ], aes(y = y3))
完整的代码示例如下:
library(ggplot2)
df <- data.frame(x = c(1, 2, 3, 4, 5),
y1 = c(2, 4, 6, 8, 10),
y2 = c(3, 6, 9, 12, 15),
y3 = c(4, 8, 12, 16, 20))
p <- ggplot(data = df, aes(x = x, y = y1))
p <- p + geom_line(aes(y = y2))
p <- p + geom_line(aes(y = y3))
p <- p + geom_point(data = df[df$x == 3, ], aes(y = y3))
# 可以根据需要进行美化
# p <- p + scale_color_manual(values = c("red", "blue", "green"))
# p <- p + scale_shape_manual(values = c(16, 17, 18))
print(p)
这样,就可以使用ggplot将单点添加到多线图中了。
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