在使用ggplot绘图时，如何隐藏某些因素？

# 假设df是你的数据框，factor_column是包含因素的列名，levels_to_hide是你想要隐藏的因素水平
filtered_df <- df[!df$factor_column %in% levels_to_hide, ]

library(ggplot2)
ggplot(filtered_df, aes(x = x_column, y = y_column, color = factor_column)) +
  geom_point()

# 设置颜色，将不需要的水平设置为NA
my_colors <- setNames(c("red", "blue", NA), levels(df$factor_column))
ggplot(df, aes(x = x_column, y = y_column, color = factor_column)) +
  geom_point() +
  scale_color_manual(values = my_colors)

# 只显示特定的因素水平
ggplot(df, aes(x = x_column, y = y_column)) +
  geom_point() +
  facet_wrap(~factor_column, scales = "free", subset = .(factor_column %in% levels_to_show))

ggplot(df, aes(x = x_column, y = y_column, color = factor_column)) +
  geom_point() +
  guides(color = guide_legend(override.aes = list(color = c("red", "blue", "white"))))