我希望更改ggplot2title中labels的legendingeom_col情节的and 。
我尝试使用下面的函数来更改legend title，但是没有任何反应：
labs(color = "Treatment")
labs(fill = "Treatment")
我还尝试使用更改图例标题和标签：
scale_fill_discrete(name = "Treatment", labels = c("Control",
"Fertilization", "Shading", "Warming))
但是，绘图列改变颜色，我收到以下错误消息：
“填充”的比例已经存在。为“填充”添加另一个比例，它将替换现有比例。
我的代码如下所示：
bar.plot.selected.groups <- ggplot(mean_emission_p12_gr3, aes (x = date, y =
avg_emission, fill = Treatment)) + geom_errorbar(aes(ymin = avg_emission -
se, ymax = avg_emission + se), width = 0.5, position = position_dodge(width
= 0.65)) + geom_col (position = "dodge", width=0.65) + theme(axis.text.x =
element_text(size = 10, angle = 90, hjust=0, vjust = 0.5), axis.title =
element_text(size = 14))
bar.plot.selected.groups + labs(x = "Date", y = "Emission rate (µg m-2 h-
1)", color = treatment) + ggtitle("BVOC emission 2012") + theme(plot.title =
element_text(size = 20, hjust = 0.5)) + facet_wrap(~ compound_gr_3, scales =
"free") + theme(strip.text.x = element_text(size = 12, color = "black",
face = "bold")) + scale_fill_manual("legend", values = c("C" = "black", "F"
= "green", "S" = "blue", "W" = "red"))