R language ggplot2 visualization: use the element_text function to set the axis title text to a bold font (Bold Font, so that the title text of the x-axis and the Y-axis use a bold font)

R language ggplot2 visualization: use the element_text function to set the axis title text to a bold font (Bold Font, so that the title text of the X-axis and Y-axis uses a bold font)

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Origin blog.csdn.net/zhongkeyuanchongqing/article/details/121890826