ggplot2怎么隐藏图例

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其一利用引导元素guides实现：

代码：

library('ggplot2')library('reshape2')A = c("A","B","C","D","E")B = c(90,34,56,99,15)C = c(50,20,24,70,14)dat = data.frame(A,B,C)names(dat) = c("type","sample1","sample2")dat = melt(dat,variable.name="Sample",value.name = "Num")head(dat)p = ggplot(dat, aes(x = type,y = Num,fill = Sample))+    geom_bar(stat ="identity",width = 0.6,position = position_dodge(width=0.8))+          scale_fill_manual(values = c("red","blue"))+  labs(x = "",y = "", title = "test")+    geom_text(aes(label = dat$Num),position=position_dodge(width = 0.9),size = 5,vjust = -0.25)+    guides(fill = guide_legend(reverse = F))+  theme(plot.title = element_text(size = 25,face = "bold", vjust = 0.5, hjust = 0.5),        legend.title = element_blank(),        legend.text = element_text(size = 18, face = "bold"),        legend.position = 'right',        legend.key.size=unit(0.8,'cm'))print(p)

结合guides将fill生成的图例进行隐藏

p=p+guides(fill=F)p

图例消失。

如果涉及其他的几何对象geom，可能还有图例生成的其他方式，包括aes(color、size、shape)等，都可以通过guides(color=F,size=F...)等方式去调整图例。由此可见利用guides隐藏图例时进行局部隐藏，可以针对特定图例进行操作。

其二可以利用theme(legend.position="none")，将全局图例进行隐藏。譬如

library('ggplot2')library('reshape2')A = c("A","B","C","D","E")B = c(90,34,56,99,15)C = c(50,20,24,70,14)dat = data.frame(A,B,C)names(dat) = c("type","sample1","sample2")dat = melt(dat,variable.name="Sample",value.name = "Num")head(dat)p = ggplot(dat, aes(x = type,y = Num,fill = Sample))+    geom_bar(stat ="identity",width = 0.6,position = position_dodge(width=0.8))+          scale_fill_manual(values = c("red","blue"))+  labs(x = "",y = "", title = "test")+    geom_text(aes(label = dat$Num),position=position_dodge(width = 0.9),size = 5,vjust = -0.25)+    guides(fill = guide_legend(reverse = F))+  theme(plot.title = element_text(size = 25,face = "bold", vjust = 0.5, hjust = 0.5),        legend.position = "none")print(p)

这种方法对所有图例同时隐藏，如果出现多图例操控，可以选则这种方法。

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