用自定义渐变填充直方图箱 [英] Fill histogram bins with a custom gradient

问题描述

我想在R和ggplot2中创建一个直方图，其中垃圾箱基于它们的连续x值填充.大多数教程仅以离散值或密度/计数来着色.

I want to create a histogram in R and ggplot2, in which the bins are filled based on their continuous x-value. Most tutorials only feature coloring by discrete values or density/count.

按照此示例，可以使用彩虹鳞片:

Following this example was able to color the bins with a rainbow scale:

df <- data.frame(x = runif(100))

ggplot(df) +
  geom_histogram(aes(x), fill = rainbow(30))

彩虹直方图

我想使用一种颜色渐变，其中垃圾箱从蓝色(最低)到黄色(最高). scale_fill_gradient()函数似乎可以达到目的，但是当我将它插入rainbow()代替fill参数时，我收到一个错误:

I want to use a color gradient, where the bins are from blue (lowest) to yellow (highest). The scale_fill_gradient() function seems to achive that, yet when i insert it in place of rainbow() for the fill argument i receive an error:

> ggplot(df) +
+ geom_histogram(aes(x), fill = scale_fill_gradient(low='blue', high='yellow'))

Error: Aesthetics must be either length 1 or the same as the data (30): fill

我尝试了几种方法来为秤提供30的长度，但是每次都会遇到相同的错误.所以我的问题是:

I tried several ways to supply the length of 30 for the scale, yet i get the same error every time. So my question is:

1. scale_color_gradient是fill参数的正确函数还是我必须使用另一个函数?
2. 如果功能正确，如何正确提供长度?

1. Is scale_color_gradient the right function for the fill argument or do i have to use another one?
2. If it is the right function, how can i correctly supply the length?

推荐答案

如果要为每个容器使用不同的颜色，则需要在美观中指定fill = ..x..，这是geom_histogram的必要要求.将scale_fill_gradient与您喜欢的颜色渐变一起使用会产生以下输出:

If you want different colors for each bin, you need to specify fill = ..x.. in the aesthetics, which is a necessary quirk of geom_histogram. Using scale_fill_gradient with your preferred color gradient then yields the following output:

ggplot(df, aes(x, fill = ..x..)) +
  geom_histogram() +
  scale_fill_gradient(low='blue', high='yellow')

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