使用考试文档类在 R-markdown 中运行代码块 [英] Running code chunk in R-markdown using exam document class

问题描述

我想在考试文档类中的问题级别下运行代码块，但我一直收到错误消息.我假设这是因为它认为 R 代码的输出是 Latex 代码.

I would like to run a code chunk under a question level in the exam document class, but I keep receiving errors. I am assuming this is because it believes the output from the R-code is Latex code.

---
output: pdf_document
documentclass: exam
header-includes: \usepackage{float}
---
\begin{questions}
    \question Answer question...
     ```{r}
        iris%>%
           group_by(Species)%>%
           summarize(Total=n())
     ```
    \end{questions}

推荐答案

有时 \begin{"some environment") ... \end{"some environment") 与R 块.一种解决方法是定义一个新环境.

Sometimes \begin{"some environment") ... \end{"some environment") doesn't play well with R chuncks. One work around is to define a new environment.

例如，我定义了一个文件 preamble.tex，其中包含以下信息:

For example, I defined a file preamble.tex with the following information:

preamble.tex

\usepackage{float}
\newcommand{\bQ}{\begin{questions}}
\newcommand{\eQ}{\end{questions}}

然后，我运行了以下内容.

Then, I ran the following.

exam.Rmd

---
documentclass: exam
geometry: margin=.5in
output: 
  pdf_document: 
    highlight: haddock
    includes:
      in_header: preamble.tex
      before_body: doc-prefix.tex
      after_body: doc-suffix.tex
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
```

\bQ

## Including Plots

\question You can also embed plots, for example:

```{r pressure, echo=FALSE}
plot(pressure)
```

```{r cars}
summary(cars)
```

\question We can keep the pound signs.

\eQ

这是结果输出.

输出

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