问题
When I use knitr to build an HTML document out of the following code:
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')
```
I get output where the code in chunk1 is interleaved with the output of the cat statements. Interestingly, the output within the for loop is output as a single block.
I would prefer to have all of the code from chunk1 to appear first, followed by all of the output from chunk1. Is there a way to ask Rmarkdown/knitr to avoid the more granular interweaving that it's currently doing?
回答1:
Here is the solution I proposed
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}
```
In the latest version of knitr, @yihui has added a new chunk option results = "hold", which automatically holds printing of all output to the end. Accordingly, we can just write
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')
```
来源：https://stackoverflow.com/questions/18517293/prevent-knitr-rmarkdown-from-interleaving-chunk-output-with-code