在R标记中向代码块添加换行符

我使用带有R标记的knitr包来创建HTML报告。在使用“+”时，我很难将代码保持在单独的行上

比如说,

```{r}
ggplot2(mydata, aes(x, y)) +
   geom_point()
```

将在HTML文档中返回以下内容

ggplot2(mydata, aes(x, y)) + geom_point()

通常这很好，但是一旦我开始添加额外的行，问题就出现了，我希望将这些行分开，以使代码更容易理解。运行以下命令：

```{r}
ggplot2(mydata, aes(x, y)) +
   geom_point() +
   geom_line() +
   opts(panel.background = theme_rect(fill = "lightsteelblue2"),
        panel.border = theme_rect(col = "grey"),
        panel.grid.major = theme_line(col = "grey90"),
        axis.ticks = theme_blank(),
        axis.text.x  = theme_text (size = 14, vjust = 0),
        axis.text.y  = theme_text (size = 14, hjust = 1.3))
```

将导致所有代码在一行中显示，使其更难遵循：

ggplot2(mydata, aes(x, y)) + geom_point() + geom_line() + opts(panel.background = theme_rect(fill = "lightsteelblue2"), panel.border = theme_rect(col = "grey"), panel.grid.major = theme_line(col = "grey90"), axis.ticks = theme_blank(), axis.text.x  = theme_text (size = 14, vjust = 0), axis.text.y  = theme_text (size = 14, hjust = 1.3))

---

如果您能帮助解决此问题，我们将不胜感激

尝试区块选项

tidy=FALSE

：

```{r tidy=FALSE}
ggplot2(mydata, aes(x, y)) +
  geom_point() +
  geom_line() +
  opts(panel.background = theme_rect(fill = "lightsteelblue2"),
       panel.border = theme_rect(col = "grey"),
       panel.grid.major = theme_line(col = "grey90"),
       axis.ticks = theme_blank(),
       axis.text.x  = theme_text (size = 14, vjust = 0),
       axis.text.y  = theme_text (size = 14, hjust = 1.3))
```

---

我发现将块的“整洁”设置更改为false的一种方法是添加mid命令注释。这似乎使整个块被处理为不整洁的，从而考虑到代码中有（或没有）的换行符。遗憾的是，这不会在as特定位置（针对特定行）添加换行符

示例：将下面的原始文本复制到Rmd文件中，并使用knitr进行处理

整洁（即默认） 输入 输出 不整洁的 输入 输出

---

有没有一种方法可以对整个文档进行全局设置？是的，IIRC

opts\u chunk$set（tidy=FALSE）

Hrm。如果您想要代码段之间的换行符，比如说，在geom_点和geom_线之间有一个额外的换行符，那么即使使用tidy=FALSE，换行符也会消失。

```{r eval=FALSE}
# Line comments do not seem to change tidiness.
list(
    sublist=list( 
        suba=10, subb=20 ),
    a=1,
    b=2 ) # End of line comment does not seem to change tidiness.
    
list(
    sublist=list( 
        suba=10, subb=20 ),
    a=1,
    b=2 )

```

# Line comments do not seem to change tidiness.
list(sublist = list(suba = 10, subb = 20), a = 1, b = 2) # End of line comment does not seem to change tidiness.

list(sublist = list(suba = 10, subb = 20), a = 1, b = 2)

```{r eval=FALSE}
list(
    sublist=list( 
        suba=10, subb=20 ),
    a=1, # Mid-command comment seems to "untidy" the chunk.
    b=2 )
    
list(
    sublist=list( 
        suba=10, subb=20 ),
    a=1,
    b=2 )

```

list(
    sublist=list(
        suba=10, subb=20 ),
    a=1, # Mid-command comment seems to "untidy" the chunk.
    b=2 )

list(
    sublist=list(
        suba=10, subb=20 ),
    a=1,
    b=2 )