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）

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.

an overall title for the plot: see title.

a sub title for the plot: see title.

a title for the x axis: see title.

a title for the y axis: see title.

the y/x aspect ratio, see plot.window.

例子对比：