r - 在 R Markdown 中为代码块添加换行符

Question

我正在使用带有 R Markdown 的 knitr 包来创建 HTML 报告。使用“+”时，我在将代码放在单独的行上时遇到了一些麻烦。

例如，

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

将返回以下 HTML 文档

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就会出现问题，我想将它们分开以使代码更容易理解。运行以下:

```{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出现，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))

任何解决此问题的帮助将不胜感激!

Answer 1

尝试 block 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))
```