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Generic X-Y Plottingusageplot(x, y, ...)Arguments

x	the coordinates of points in the plot. Alternatively, a single plotting structure, function or any R object with a plot method can be provided.（可简单理解为x轴上的数据，在R中通常为向量）
y	the y coordinates of points in the plot, optional if x is an appropriate structure.（可简单理解为y轴上的数据，在R上通常为向量）
...	type what type of plot should be drawn. Possible types are "p" for points（点）, "l" for lines（线）, "b" for both（点之间用线连接）, "c" for the lines part alone of "b"(b中仅保留线), "o" for both ‘overplotted’（用线串接点）, "h" for ‘histogram’ like (or ‘high-density’) vertical lines（垂直于x轴的线）, "s" for stair steps（x-y阶梯图）, "S" for other steps, see ‘Details’ below（y-x阶梯图）, "n" for no plotting（无图形，仅存坐标轴）. All other types give a warning or an error; using, e.g., type = "punkte" being equivalent to type = "p" for S compatibility. Note that some methods, e.g. plot.factor, do not accept this. main an overall title for the plot: see title. sub a sub title for the plot: see title. xlab a title for the x axis: see title. ylab a title for the y axis: see title. asp the y/x aspect ratio, see plot.window. 例子对比：

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thanks for sharing