防止knitr/Rmarkdown与代码交错块输出

Question

当我使用knitr从以下代码构建HTML文档时:

Chunk Output
========================================================

Outside a chunk.

```{r chunk1, results='asis'}

cat('Inside a chunk\n\n')

for (i in 1:3) {
    cat('* Inside loop #', i, '\n')
}

cat('Outside a loop, but still inside the first chunk')
```

Between chunks.

```{r chunk2, results='asis'}

cat('Inside second chunk')

```

我得到输出,其中代码chunk1与cat语句的输出交错.有趣的是,for循环内的输出作为单个块输出.

我宁愿所有的代码从chunk1先出现,然后是所有的输出从chunk1.有没有办法让Rmarkdown/knitr避免它目前正在进行的更细粒度的交织？

Answer 1

这是我提出的解决方案

Chunk Output
========================================================

Outside a chunk.

```{r chunk1, results='hide'}

cat('Inside a chunk\n\n')

for (i in 1:3) {
    cat('* Inside loop #', i, '\n')
}

cat('Outside a loop, but still inside the first chunk')
```

```{r ref.label = 'chunk1', results = 'asis', echo = F}

```

在最新版本的knitr中,@ yihui添加了一个新的chunk选项results = "hold",可以自动保存所有输出的打印结果.因此,我们可以写

Chunk Output
========================================================

Outside a chunk.

```{r chunk1, results='hold'}

cat('Inside a chunk\n\n')

for (i in 1:3) {
    cat('* Inside loop #', i, '\n')
}

cat('Outside a loop, but still inside the first chunk')
```