ggplot2错误:将变量映射到y，并且还使用stat ="bin". “用于数据分析的典雅图形"中的示例 [英] ggplot2 Error : Mapping a variable to y and also using stat="bin". example from 'Elegant Graphics for Data Analysis'

问题描述

我正在尝试学习ggplot2并将其应用于我自己的数据，但是在尝试从Hadley Wickham的数据分析的典雅图形"一书中复制图时遇到了一个问题(图4.10(右)) ，第4章:4.9.1结合几何和统计信息，第61页)，使用以下代码:

I'm trying to learn ggplot2 to apply it to my own data, but have encountered a problem when trying to reproduce a plot from the book 'Elegant Graphics for Data Analysis' by Hadley Wickham (Fig 4.10 (right), chapter 4: 4.9.1 Combining geoms and stats, p. 61) using the following code:

d <- ggplot(diamonds, aes(carat)) + xlim(0, 3)
d + stat_bin(aes(y = 1, fill = ..count..), binwidth = 0.1, geom = "tile", position="identity")

它会导致以下错误消息:

It results in the following error message:

# Error : Mapping a variable to y and also using stat="bin".
# With stat="bin", it will attempt to set the y value to the count of cases in each group.
# This can result in unexpected behavior and will not be allowed in a future version of ggplot2. 
# If you want y to represent counts of cases, use stat="bin" and don't map a variable to y. 
# If you want y to represent values in the data, use stat="identity".
# See ?geom_bar for examples. (Defunct; last used in version 0.9.2)

如何重现所需的图/修复错误?如果可以的话，请您解释一下. geom_tile如何产生相同类型的图?

How can I reproduce the desired plot/fix the error? Could you please explain it bit if possible. How could the same kind of plot be produced using geom_tile?

非常感谢您的帮助！

推荐答案

在?geom_tile中运行等效示例时，会产生相同的错误，例如cars + stat_bin(aes(fill=..count..), geom="tile", binwidth=3, position="identity").仍然在 此处 中找到了输出，还显示了什么我认为是警告消息，在较早的ggplot2版本中.

The same error is produced when running the equivalent examples in ?geom_tile, e.g. cars + stat_bin(aes(fill=..count..), geom="tile", binwidth=3, position="identity"). The output is still found here though, also showing what I assume was the warning message in older ggplot2 versions.

一种可能的解决方案是使用stat_bin2d(带有虚拟y变量)并使用binwidth自变量. binwidth向量(c(0.1, 1))中的第一个数字是x值，第二个是y值. binwidth未在帮助文本的参数"部分中记录，但可以在中找到示例

One possible solution would be to use stat_bin2d, with a dummy y variable, and use the binwidth argument. The first number in the binwidth vector (c(0.1, 1)) refers to x values and the second to the y values. binwidth is not documented in the 'Arguments' section in the help text, but can be found among the examples

ggplot(diamonds, aes(x = carat, y = factor(1))) + xlim(0, 3) +
  stat_bin2d(binwidth = c(0.1, 1))

更新:有关错误消息的更详尽说明，请参见

Update: For a more thorough account of the error message, see this nice Q&A

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