시각화할 때 색상입히기에 사용한다.
출처 : http://www.cookbook-r.com/Graphs/Colors_(ggplot2)/
Colors (ggplot2)
Problem You want to use colors in a graph with ggplot2. Solution The default colors in ggplot2 can be difficult to distinguish from one another because they have equal luminance. They are also not friendly for colorblind viewers. A good general-purpose sol
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