在 ggplot2 中创建密度直方图? [英] Creating a density histogram in ggplot2?

问题描述

我想用 ggplot2 创建下一个直方图密度图.以正常"方式(基础包)非常简单:

I want to create the next histogram density plot with ggplot2. In the "normal" way (base packages) is really easy:

set.seed(46)
vector <- rnorm(500)  
breaks <- quantile(vector,seq(0,1,by=0.1))
labels = 1:(length(breaks)-1)
den = density(vector)
hist(df$vector,
     breaks=breaks,
     col=rainbow(length(breaks)),
     probability=TRUE)
lines(den)

到目前为止，我已经通过 ggplot 达到了这一点:

With ggplot I have reached this so far:

seg <- cut(vector,breaks,
           labels=labels,
           include.lowest = TRUE, right = TRUE)
df = data.frame(vector=vector,seg=seg)

ggplot(df) + 
     geom_histogram(breaks=breaks,
                    aes(x=vector,
                        y=..density..,
                        fill=seg)) + 
     geom_density(aes(x=vector,
                      y=..density..))

但是y"比例尺的尺寸错误.我注意到下一次运行的y"刻度是正确的.

But the "y" scale has the wrong dimension. I have noted that the next run gets the "y" scale right.

 ggplot(df) + 
     geom_histogram(breaks=breaks,
                    aes(x=vector,
                    y=..density..,
                    fill=seg)) + 
     geom_density(aes(x=vector,
                      y=..density..))

我就是不明白.y=..density.. 在那里，应该是高度.那么究竟为什么当我尝试填充时我的比例会被修改呢?

I just do not understand it. y=..density.. is there, that should be the height. So why on earth my scale gets modified when I try to fill it?

我确实需要颜色.我只想要一个直方图，其中每个块的中断和颜色是根据默认的 ggplot 填充颜色定向设置的.

I do need the colours. I just want a histogram where the breaks and the colours of each block are directionally set according to the default ggplot fill colours.

推荐答案

我手动为您的百分位栏添加了颜色.看看这是否适合你.

Manually, I added colors to your percentile bars. See if this works for you.

library(ggplot2)

ggplot(df, aes(x=vector)) +   
   geom_histogram(breaks=breaks,aes(y=..density..),colour="black",fill=c("red","orange","yellow","lightgreen","green","darkgreen","blue","darkblue","purple","pink")) + 
   geom_density(aes(y=..density..)) +
   scale_x_continuous(breaks=c(-3,-2,-1,0,1,2,3)) +
   ylab("Density") + xlab("df$vector") + ggtitle("Histogram of df$vector") +
   theme_bw() + theme(plot.title=element_text(size=20),
                      axis.title.y=element_text(size = 16, vjust=+0.2),
                      axis.title.x=element_text(size = 16, vjust=-0.2),
                      axis.text.y=element_text(size = 14),
                      axis.text.x=element_text(size = 14),
                      panel.grid.major = element_blank(),
                      panel.grid.minor = element_blank())

这篇关于在 ggplot2 中创建密度直方图?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！