How does ggplot2 hide the legend

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One uses the guide element guides to achieve:

Code:

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)

Hide the legend generated by fill with guides

p=p+guides(fill=F)p

Legend disappears.

If other geometric objects geom are involved, there may be other ways to generate legends, including aes(color, size, shape), etc., which can be generated through guides(color=F,size=F...) And so on to adjust the legend. This shows that when you hide a legend with guides, you can hide it locally, and you can operate on a specific legend.

Second, you can use theme(legend.position="none") to hide the global legend. for example

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)

This method hides all legends at the same time, and can be selected if multiple legend manipulations occur.

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