更改堆疊條形圖中的組的順序和R中的圖例？

Question

我知道這類問題已經被問到了，但我已經嘗試將它應用於我的數據集幾個小時，但沒有成功。

這裏是我的數據框

> df 
     prot X nr 
1 unmodified same 68 
2  1 Ac same 14 
3  2 Ac same 7 
4  3 Ac same 4 
5  4 Ac same 3 
6  5 Ac same 2 
7  6 Ac same 1 
8  7 Ac same 2 

我試圖調整組的順序的兩種方式，但在兩種情況下，傳說是正好相反的順序。我怎樣才能將情節中的羣體的順序與傳說中的羣體的順序相匹配？ WAY1：

y <- read.csv("df.csv",sep=",") #sep=";" 
df <- data.frame(y) 

df$prot <- factor(df$prot, levels = rev(df$prot)) #order groups 

p<-ggplot(df, aes(x=X, y=nr, fill=prot)) + 
geom_bar(stat="identity", position=position_stack(), width=0.2, colour="gray", aes(fill = prot))+ # stacked, bar-width, outline-colour = colour 
theme(panel.background = element_rect(fill = "ivory" , colour="ivory"))+ 
coord_flip()+ 
theme(legend.position="bottom") + 
guides(fill = guide_legend(nrow = 1)) + 
geom_text(aes(label=nr), color="black",vjust = -3, position = position_stack()) # add labels (%) non-overlapping 

p 

給我這樣的結果：

way2：

y <- read.csv("df.csv",sep=",") #sep=";" 
df <- data.frame(y) 

df$prot <- factor(df$prot, levels = c("7 Ac", "6 Ac", "5 Ac", "4 Ac", "3 Ac", "2 Ac", "1 Ac","unmodified")) #order groups 

df <- ddply(df, .(X), 
     transform, pos = cumsum(nr) - (0.5 * nr)) #adjust the position of the data labels:create new variable at the centre of each bar 

p<-ggplot(data=df, aes(x=X, y=nr, fill=prot)) + 
geom_bar(stat="identity", position=position_stack(), width=0.2, colour="gray")+ # stacked, bar-width, outline-colour = colour 
theme(panel.background = element_rect(fill = "ivory" , colour="ivory"))+ #backgroundcolor 
coord_flip()+ 
theme(legend.position="bottom") + 
guides(fill = guide_legend(nrow = 1)) + 
geom_text(data=df, aes(x = X, y = pos, label = paste0(nr,"%")), 
     size=4) 

p 

p 

給我這樣的結果：

Answer 1

你只需要使用reverse參數guide_legend並設置它到TRUE，如：

df<- data.frame(prot = c("unmodified", paste(1:7, "AC")), X = rep("same", 8), 
        nr = c(68,14,7,4,3,2,1,2)) 

library(ggplot2) 

df$prot <- factor(df$prot, levels = rev(df$prot)) #order groups 

p<-ggplot(df, aes(x=X, y=nr, fill=prot)) + 
     geom_bar(stat="identity", position=position_stack(), width=0.2, colour="gray", aes(fill = prot))+ # stacked, bar-width, outline-colour = colour 
     theme(panel.background = element_rect(fill = "ivory" , colour="ivory"))+ 
     coord_flip()+ 
     theme(legend.position="bottom") + 
     # to change ordering of legend, set reverse = TRUE 
     guides(fill = guide_legend(nrow = 1, reverse = TRUE)) + 
     geom_text(aes(label=nr), color="black",vjust = -3, position = position_stack()) # add labels (%) non-overlapping 

p