如何在 R 中使用 knitr 创建一个包含代码块和文本的循环 [英] how to create a loop that includes both a code chunk and text with knitr in R

问题描述

我想弄清楚如何创建一个循环，将一些文本插入到 rmarkdown 文件中，然后生成与该标题对应的图形或表格.以下是我想象它的工作方式:

I am trying to figure out how to create a loop that inserts some text into the rmarkdown file, and then produces the graph or table that corresponds to that header. The following is how I picture it working:

for(i in 1:max(month)){
### `r month.name[i]` Air quaility

```{r, echo=FALSE}
plot(airquality[airquality$Month == 5,])
```
}

这当然只是将 for 循环打印为文本，如果我用 r`` 包围 for 循环，我只会得到一个错误.

This ofcourse just prints the for loop as text, if i surround the for loop with r`` I would just get an error.

我希望代码生成一个如下所示的 rmd 文件:

I want the code to produce an rmd file that looks like this:

剧情

剧情

等等等等.有任何想法吗?我不能使用乳胶，因为我在工作时他们不让我们下载 exe 文件，而且我也不知道如何使用乳胶.我想制作一个word文档.

and so on and so forth. any ideas? I cannot use latex because I at my work they do not let us download exe files, and I do not know how to use latex anyways. I want to produce a word document.

推荐答案

您可以使用 cat() 将 Markdown 嵌入循环中.

You can embed the markdown inside the loop using cat().

注意:您需要设置 results="asis" 以将文本呈现为 Markdown.请注意:您将需要在 新行字符前面有两个空格才能让 knitr 在有情节的情况下正确呈现降价.

Note: you will need to set results="asis" for the text to be rendered as markdown. Note well: you will need two spaces in front of the new line character to get knitr to properly render the markdown in the presence of a plot out.

# Monthly Air Quality Graphs
```{r pressure,fig.width=6,echo=FALSE,message=FALSE,results="asis"}

attach(airquality)
for(i in unique(Month)) {
  cat("  
###",  month.name[i], "Air Quaility  
")
  #print(plot(airquality[airquality$Month == i,]))
  plot(airquality[airquality$Month == i,])
  cat("  
")
}
```

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