Web Reference: However, in most cases you start with ggplot(), supply a dataset and aesthetic mapping (with aes()). You then add on layers (like geom_point() or geom_histogram()), scales (like scale_colour_brewer()), faceting specifications (like facet_wrap()) and coordinate systems (like coord_flip()). ggplot2的语法与base r不同。 根据基本元素，默认的ggplot需要指定三样东西: 数据，美学和几何形状。 我们总是通过调用ggplot (data = df)来定义绘图对象，它只告诉ggplot2我们将处理该数据。 27.3.3 颜色、符号、线型等映射 在 ggplot() 函数的 mapping 参数的 aes() 设定中将变量映射到x、y轴， 颜色、符号、线型等图形元素类型， 也可以作为图形设置将某些图形元素设置为固定值。 例如， 用不同颜色表示不同大洲， 就是将 continent 变量映射到 color:
YouTube Excerpt: Using
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