r - 在ggforce::geom_parallel_sets上排列y轴

使用ggforce软件包的开发版，我可以如下创建Sankey图（来自文档）

data <- reshape2::melt(Titanic)
data <- gather_set_data(data, 1:4)

ggplot(data, aes(x, id = id, split = y, value = value)) +
  geom_parallel_sets(aes(fill = Sex), alpha = 0.3, axis.width = 0.1) +
  geom_parallel_sets_axes(axis.width = 0.1) +
  geom_parallel_sets_labels(colour = 'white')

我正在努力使y轴变量以默认方式以外的任何其他方式排序，默认方式似乎是反向字母。例如，更改图，使Adult出现在图的顶部附近，而Child出现在图的下面。

我试过在应用gather_set_data之前重新调整因子，以及在应用y之后重新调整gather_set_data变量，但似乎都不起作用。我也尝试过将它们定义为字符并按不同顺序排序，但这似乎也不起作用。

任何帮助，将不胜感激。

最佳答案

由于我不使用此软件包，因此不确定您对ggforce会做什么。我认为解决方案是重新调整您提到的因素，但这似乎对您不起作用。但是，这对ggalluvial起作用。此外，还有一个参数reverse允许您颠倒顺序（字母/字母颠倒）。见下文：

默认排序

library(ggplot2)
library(ggalluvial)

df <- as.data.frame(Titanic)

ggplot(as.data.frame(df),
       aes(weight = Freq,
           axis1 = Survived, axis2 = Sex, axis3 = Class)) +
  geom_alluvium(aes(fill = Class),
                width = 0, knot.pos = 1/4, reverse = FALSE) +
  guides(fill = FALSE) +
  geom_stratum(width = 1/8, reverse = FALSE) +
  geom_text(stat = "stratum", label.strata = TRUE, reverse = FALSE) +
  scale_x_continuous(breaks = 1:3, labels = c("Survived", "Sex", "Class")) +
  ggtitle("Titanic survival by class and sex")

逆序

ggplot(as.data.frame(df),
       aes(weight = Freq,
           axis1 = Survived, axis2 = Sex, axis3 = Class)) +
  geom_alluvium(aes(fill = Class),
                width = 0, knot.pos = 1/4, reverse = TRUE) +
  guides(fill = FALSE) +
  geom_stratum(width = 1/8, reverse = TRUE) +
  geom_text(stat = "stratum", label.strata = TRUE, reverse = TRUE) +
  scale_x_continuous(breaks = 1:3, labels = c("Survived", "Sex", "Class")) +
  ggtitle("Titanic survival by class and sex")

重新调整因子

df$Class <- factor(df$Class, levels = c("3rd", "1st", "Crew", "2nd"))

ggplot(as.data.frame(df),
       aes(weight = Freq,
           axis1 = Survived, axis2 = Sex, axis3 = Class)) +
  geom_alluvium(aes(fill = Class),
                width = 0, knot.pos = 1/4, reverse = FALSE) +
  guides(fill = FALSE) +
  geom_stratum(width = 1/8, reverse = FALSE) +
  geom_text(stat = "stratum", label.strata = TRUE, reverse = FALSE) +
  scale_x_continuous(breaks = 1:3, labels = c("Survived", "Sex", "Class")) +
  ggtitle("Titanic survival by class and sex")