R language ggplot2 visualization: ggplot2 visualization grouping box diagram, place the legend and title of the visualization image on the top left of the image and align them to the left, in which th

R Language ggplot2 visualization :ggplot2 Visual grouping box diagram , The legend of the visualized image （legend） And the title （title） Place at the top left of the image and align left 、 The legend information is horizontally tiled ​ （position legend and title top left）

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