多条 ggplot2 图表中的排序图例

Question

我想要一个多条形图，水平条，其中条形颜色的图例与条形本身的顺序相同。我看过几篇对这里的示例有影响的文章，但我无法让它发挥作用。

在这个例子中，"Group"在条形图中是一个顺序，在图例中是相反的顺序。

library(ggplot2)

# create data for tidy format
Category <- c("Category1","Category2","Category3","Category4","Category5","Category1","Category2","Category3","Category4","Category5","Category1","Category2","Category3","Category4","Category5")
GroupTitle <- c("GroupA","GroupA","GroupA","GroupA","GroupA","GroupB","GroupB","GroupB","GroupB","GroupB","GroupC","GroupC","GroupC","GroupC","GroupC")
Valuelst <- list()
for (i in 1:15){
  Valuelst[i] <- runif(1, min=0, max=1)
}
Valuelst <- unlist(Valuelst)
# make data frame
d <- data.frame(Category,GroupTitle,Valuelst)

# set factors and orders desired
d$Category <- factor(d$Category, levels = c("Category5","Category4","Category3","Category2","Category1"))
d$GroupTitle <- factor(d$GroupTitle, levels = c("GroupA","GroupB","GroupC"))

# make graph
ggplot(d, aes(x=Category, y=Valuelst, order = -as.numeric(GroupTitle))) + # order= -as.numeric() is one solution that I read
  geom_bar(aes(fill=GroupTitle), stat="identity", position="dodge") + 
  coord_flip() +
  scale_fill_manual("Legenda", values = c("GroupC" = "#deebf7", "GroupB" = "#3182bd", "GroupA" = "#9ecae1")) # scale_fill_manual is another I read

我在代码中的几个地方评论了我在其他地方看到的解决方案。也就是说，我已经确保组是一个因素，设置该因素的顺序，使用 order = -as.numeric(GroupTitle)，并尝试 scale_fill_manual，但都没有效果。

Answer 1

我使用了 ggpubr 库。诀窍是 -0.7 for position_dodge()，它使条形反转。您也可以使用

library(ggplot2)
library(ggpubr)
# create data for tidy format
Category <- paste0("Category", rep(1:5,3))
GroupTitle <- paste0("Group", rep(LETTERS[1:3], each=5))
Valuelst <- runif(15, min=0, max=1)

# make data frame - factor is default for strings
d <- data.frame(Category, GroupTitle, Valuelst)

# make graph
ggbarplot(d,x="Category", y="Valuelst", fill="GroupTitle", legend = "right",
      orientation = "horiz", position=position_dodge(-.7), 
      order = c("Category5","Category4","Category3","Category2","Category1")) +
scale_fill_manual("Legenda", values = c("GroupC" = "#deebf7", "GroupB" = "#3182bd", "GroupA" = "#9ecae1"))

你也可以在geom_bar()中使用position=position_dodge(-.9)来达到同样的效果。

ggplot(d, aes(x=Category, y=Valuelst, order = -as.numeric(GroupTitle))) + 
  geom_bar(aes(fill=GroupTitle), stat="identity", position=position_dodge(-.9)) + 
  coord_flip() +
  scale_fill_manual("Legenda", values = c("GroupC" = "#deebf7", "GroupB" = "#3182bd", "GroupA" = "#9ecae1"))

Answer 2

你几乎和 scale_fill_manual 在一起了。

  scale_fill_manual("Legenda", 
                    values = c("GroupA" = "#9ecae1", "GroupB" = "#3182bd", "GroupC" = "#deebf7"),
                    breaks = c("GroupC", "GroupB", "GroupA"))

breaks 参数将设置顺序。

Answer 3

选项 1 - 顺序：C、B 和 A

要反转图例标签，您只需添加：guides(fill = guide_legend(reverse = TRUE))。保持条形的原始顺序：C、B 和 A。

ggplot(d, aes(x = Category,
              y = Valuelst,
              fill = GroupTitle)) +
  geom_bar(stat = "identity", position = "dodge") +
  coord_flip() +
  scale_fill_manual("Legenda",
                    values = c(
                      "GroupC" = "#deebf7",
                      "GroupB" = "#3182bd",
                      "GroupA" = "#9ecae1"
                    )) +
  guides(fill = guide_legend(reverse = TRUE))

选项 2 - 顺序：A、B 和 C

要颠倒条形的顺序，我们只需在绘图前重新排列级别即可。

d$GroupTitle <- factor(d$GroupTitle, levels = c("GroupC","GroupB","GroupA"))

# make graph
ggplot(d, aes(x = Category,
              y = Valuelst,
              fill = GroupTitle)) +
  geom_bar(stat = "identity", position = "dodge") +
  coord_flip() +
  scale_fill_manual("Legenda",
                    values = c(
                      "GroupC" = "#deebf7",
                      "GroupB" = "#3182bd",
                      "GroupA" = "#9ecae1"
                    )) +
  guides(fill=guide_legend(reverse=TRUE))

多条 ggplot2 图表中的排序图例

Ordering Legend in Multi-Bar ggplot2 Chart

r

ggplot2

geom-bar