geom_density_line( mapping = NULL, data = NULL, stat = "density", position = "identity", ..., na.rm = FALSE, show.legend = NA, inherit.aes = TRUE) 参数说明: mapping : aes()files()创建的美学映射集。如有规定,以及继承.aes=TRUE(默认值),它与绘图顶层的默认映射相结合。如果没有绘图...