R language ggplot2 visualization: use ggplot2 to display dataframe data that are all classified variables in the form of thermal diagram, and customize the legend color legend of factor

R Language ggplot2 visualization ： Use ggplot2 According to the thermodynamic diagram, it is all classified variables dataframe data 、 And customize factors （factor） Legend color of legend（use heatmap to visualize dataframe）

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