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並前往https://www.reddit.com/r/rstats/comments/jv7gxr/ggplot2_legend_is_missing_despite_scale_fill/

ggplot2: Legend is missing despite scale_fill_manual() : r/rstats

Hello, I created a graph with ggplot, but the legend is missing. ... You have no data mapped to fill , so no legend will be displayed.

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