# 直方图

## 分组直方图

```r
## 改变剪切事件因子顺序
data$V2=factor(data$V2,levels = c("IR","AA","AD","ES","AP"))
## 改变基因组因子顺序
data$V1=factor(data$V1,levels = c("D5","A2","Dt","At"))

ggplot(data=data,aes(x=data$V1,y=data$V3,fill=data$V2))+geom_bar(stat = "identity",position="dodge")
""
```

### 改变柱子的宽度

`geom_bar(stat = "identity",width = 0.5)`

### 改变组内柱子间隔

`geom_bar(stat = "identity",width = 0.5,position=position_dodge(0.8))`

使用`position=position_dodge(0.8)`参数

## 密度直方图

y轴为对应的概率密度，而不是计数

```r
```

## 频数直方图

## 旋转坐标轴

```bash
coord_flip()
```

## 参考

<http://www.sohu.com/a/119501701_464826>


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