我如何控制ggplot2中的bin间隔? [英] How can i control bin intervals in ggplot2?

问题描述

我无法正确控制垃圾箱是否来自例如当我说 binwidth = 20 时，从-10到+10或从0到20，我得到了前者，但是我有从1开始的数据，并且我不希望间隔变成负数.

I cant correctly control if a bin is going from e.g. -10 to +10 or from 0 to 20 when I say binwidth = 20 i get the former but I have data that begins at 1 and I dont want the interval to go into the negatives.

这是我的问题的一个例子:

Here is an example of my problem:

testData = data.frame(x=c(1,4,6,9,9))

ggplot(data=testData, aes(x=testData$x)) +
  geom_histogram(binwidth=3, aes(col=I("white"))) +
  scale_x_continuous(breaks=c(1,2,3,4,5,6,7,8,9,10))

足够奇怪，如果我使用 binwidth = 2 ，我最终会遇到我想要的间隔:

strange enough, if I use binwidth = 2 I end up with intervals like I want:

ggplot(data=testData, aes(x=testData$x)) +
  geom_histogram(binwidth=2, aes(col=I("white"))) +
  scale_x_continuous(breaks=c(1,2,3,4,5,6,7,8,9,10))

对于更大的数据集，如何使我的垃圾箱从1..20、21..40等位置移动?

How can I get my bins to go from 1..20, 21..40, etc. for a larger dataset?

推荐答案

您可以使用 geom_histogram 的 center 自变量来做到这一点，如下所示:

You can do this by using the argument center of geom_histogram as follows:

# Make some random test data
testData = data.frame(x=runif(1000,min=1,max=110))
# Construct the plot
ggplot(data=testData, aes(x=testData$x)) +
  geom_histogram(binwidth=20,
                 center = 11,
                 aes(col=I("white"))) +
  scale_x_continuous(breaks=seq(1,max(testData$x) + 20, by = 20))

通过指定一个箱的宽度和中心，您可以定义该箱应为20宽，并以11为中心.因此，第一个箱将为1到21.

By specifying the binwidth and the center for one bin, you define that the bin should be 20 wide and be centered around 11. So the first bin will be 1 to 21.

我还添加了一个 seq()调用，以构造x轴刻度，而无需手动键入所有刻度.结果图如下:

I also added a seq() call to construct the x axis ticks without having to type all of them manually. The resulting plot is the following:

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