ggplot2 error：提供给连续标度R的离散值

Question

我有一个名为“alldata”的数据集，其中包含1000行和2列，名为“day_of_Week”和“label”。数据集如下所示：

day_of_Week    label
      5        Wday, Clicked
      2        Wday, Clicked
      4        Wday, Clicked
      4        Wday, Clicked
      2        Wday, Clicked
      6        Wday, Clicked
      2        Wday, Clicked
      2        Wday, Clicked
      3        Wday, Clicked
      2        Wday, Clicked

我正在使用ggplot2绘制数据，

ggplot(alldata, aes(day_of_Week, fill = label)) + geom_density(alpha = 0.2) + xlim(55, 70)

但是，我收到此错误

Error: Discrete value supplied to continuous scale

我已经更改了关于xlim或alpha的值，但我仍然得到错误。 你知道这段代码有什么问题吗？错误来自何处，以及如何使其发挥作用？

谢谢

Answer 1

喜欢这个？ （以下代码）

alldata  <- structure(list(day_of_Week = c(5L, 2L, 4L, 4L, 2L, 6L, 2L, 2L, 
3L, 2L), label = structure(c(1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 
1L, 1L), .Label = "Wday, Clicked", class = "factor")), .Names = c("day_of_Week", 
"label"), class = "data.frame", row.names = c(NA, -10L))

# install.packages("ggplot2", dependencies = TRUE)
require(ggplot2)

m <- ggplot(alldata, aes(x = day_of_Week))
m + geom_density(aes(fill=label))

可能更具说明性

alldata$label2 <- rep(c("Wday, Clicked", "Wday, Not clicked"), 5)

m <- ggplot(alldata, aes(x = day_of_Week))
m + geom_density(aes(fill=label2), alpha=0.3)