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

我试图弄清楚如何创建一个循环，该循环将一些文本插入到rmarkdown文件中，然后生成与该标头相对应的图形或表.以下是我如何看待它的工作原理:

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:

情节

情节

，依此类推.有任何想法吗?我不能使用乳胶，因为在我的工作中，他们不允许我们下载exe文件，而且我也不知道如何使用乳胶.我要生成一个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:您需要将results="asis"设置为要呈现为markdown的文本. 请注意:在\n换行符前面需要两个空格，以使knitr在存在绘图的情况下正确渲染减价.

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 \n 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("  \n###",  month.name[i], "Air Quaility  \n")
  #print(plot(airquality[airquality$Month == i,]))
  plot(airquality[airquality$Month == i,])
  cat("  \n")
}
```

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