r - 使用考试包生成带有图像的 Moodle 练习

Question

我正在使用exams包，我想用它生成一些Moodle练习，其中包含一些图像。尽管在 *rmd 文件中使用此代码:

```{r, echo = FALSE, results = "hide"}
exams::include_supplement("ae1_2_1e2.png")
```
Question
========
Question text:

\centering
$\includegraphics[width=0.55 \textwidth] {ae1_2_1e2.png}$

Answerlist
----------
* answer a
* answer b
* answer c
* answer d


Solution
========


Answerlist
----------
* True
* False
* False
* False


Meta-information
================
exname: ae1_2_1
extype: schoice
exsolution: 1000
exshuffle: 4

这会在 Moodle 中产生以下结果:

另一个问题是，该软件包是否允许在 Moddle 练习(即 schoice)中使用图像作为选项？示例:

```{r, echo = FALSE, results = "hide", out.width = "20%"}
exams::include_supplement(c("ae4_3_2_1e2.png","ae4_3_2_3e4.png"))
```
Question
========
For a right-tailed test (using the Neyman-Pearson criteria), which would be the rejection region for a t-test (independent samples)?

Answerlist
----------
* \ ![](ae4_3_2_1e2.png) $\bigg]-\infty;-t_{1-\frac{\alpha}{2};(n_1+n_2-2)}\bigg] \cup \bigg[t_{1-\frac{\alpha}{2};(n_1+n_2-2)};+\infty\bigg[$.
* \ ![](ae4_3_2_1e2.png) $\bigg]-\infty;-t_{1-\frac{\alpha}{2};(n_1-n_2)}\bigg] \cup \bigg[t_{1-\frac{\alpha}{2};(n_1-n_2)};+\infty\bigg[$.
* \ ![](ae4_3_2_3e4.png) $\bigg[t_{1-\alpha;(n_1-n_2)};+\infty\bigg[$.
* \ ![](ae4_3_2_3e4.png) $\bigg[t_{1-\alpha;(n_1+n_2-2)};+\infty\bigg[$.

已解决

You cannot have the same image file in different options. If you want to use the same image, you have to produce a copy of it and use a different name.

So the new code:

```{r, echo = FALSE, results = "hide", out.width = "20%"}
exams::include_supplement(c("ae4_3_2_1.png","ae4_3_2_3.png","ae4_3_2_2.png","ae4_3_2_4.png"))
```
Question
========
For a right-tailed test (using the Neyman-Pearson criteria), which would be the rejection region for a t-test (independent samples)?

Answerlist
----------
* \ ![](ae4_3_2_1.png){width=20%} $\bigg]-\infty;-t_{1-\frac{\alpha}{2};(n_1+n_2-2)}\bigg] \cup \bigg[t_{1-\frac{\alpha}{2};(n_1+n_2-2)};+\infty\bigg[$.
* \ ![](ae4_3_2_2.png){width=20%} $\bigg]-\infty;-t_{1-\frac{\alpha}{2};(n_1-n_2)}\bigg] \cup \bigg[t_{1-\frac{\alpha}{2};(n_1-n_2)};+\infty\bigg[$.
* \ ![](ae4_3_2_3.png){width=20%} $\bigg[t_{1-\alpha;(n_1-n_2)};+\infty\bigg[$.
* \ ![](ae4_3_2_4.png){width=20%} $\bigg[t_{1-\alpha;(n_1+n_2-2)};+\infty\bigg[$.

Meta-information
================
exname: RTT
extype: schoice
exsolution: 0001
exshuffle: TRUE

结果(感谢@Achim):

Answer 1

当您使用 R/Markdown (.Rmd) 练习时，应使用 Markdown 来包含静态图形文件:

Question text:
\
![](ae1_2_1e2.png)

可以包含 LaTeX，但仅限于数学方程 - 将 \includegraphics{} 置于数学模式此处不合适。

包含静态 PNG 文件的示例模板位于:http://www.R-exams.org/templates/Rlogo/ 。请注意，反斜杠以此处不添加标题的方式嵌入图像。有关更多详细信息，请参阅 pandoc 文档:https://pandoc.org/MANUAL.html#images

下面也是一个在 Moodle 中将图像作为答案的工作示例 (mice.Rmd)，将所有图像的宽度限制为相同的值:

```{r, include=FALSE}
download.file("https://i.pinimg.com/originals/f7/7b/17/f77b173fb104d07130697c9d3a024e75.png", "a.png")
download.file("https://upload.wikimedia.org/wikipedia/en/thumb/f/fe/Speedy_Gonzales.svg/1200px-Speedy_Gonzales.svg.png", "b.png")
download.file("https://www.disneyclips.com/images3/images/basil-great-mouse-detective.png", "c.png")
```

Question
========
Which of these cartoon mice belongs to the Disney franchise?

Answerlist
----------
* ![](a.png){width=20%}
* ![](b.png){width=20%}
* ![](c.png){width=20%}

Meta-information
================
exname: Mice
extype: schoice
exsolution: 001
exshuffle: TRUE

在 Moodle 中，这是通过以下方式呈现的: