r - Rmd 文件中的 knit_child 正在打印不需要的输出

Question

我已成功使用knit_child生成pdf文件，遵循代码http://yihui.name/knitr/demo/child/ ，但是当我尝试在 .Rmd 文件中使用该示例时:

```{r, results='asis', echo=FALSE, message=FALSE}
out = NULL
for (p in c("p1","p2","p3","p4","p5","p6","p7","p8","p9","p10")) {
  out = c(out, knit_child('quick_variable.Rmd'))
  cat(out)
}
```

(我修改了原始代码，以便在 Rmd 中工作)。

我有两个问题，第一个问题:

|
| | 0% |
|... | 5% ordinary text without R code

|
|....... | 11% label: unnamed-chunk-4 (with options) List of 1 $ echo: logi FALSE

|
|.......... | 16% ordinary text without R code

|
|.............. | 21% label: unnamed-chunk-5 (with options) List of 2 $ echo : logi FALSE $ results: chr "asis"
.... 
(the output follows)

显然所有这些输出都是不需要的。我相信这个问题与上面代码中使用 cat 有关，但是如果我删除它，则不会输出，不会打印任何图。我能做些什么来解决这个问题？

提前致谢

Answer 1

您可以在 out 中收集结果，并稍后在内联 R 表达式中将其写入输出，例如

```{r include=FALSE}
out = NULL
for (p in c("p1","p2","p3","p4","p5","p6","p7","p8","p9","p10")) {
  out = c(out, knit_child('quick_variable.Rmd'))
}
```
`r paste(out, collapse='\n')`