如何在 rmarkdown 中交叉引用表格和图表？

Question

我正在使用以下模板

---
title: "Nice try buddy"
author: "SpaceMan"
date: "13 December 2057"
output:
  bookdown::pdf_document2
header-includes:
- \usepackage{booktabs}
- \usepackage{longtable}
- \usepackage{array}
- \usepackage{multirow}
- \usepackage[table]{xcolor}
- \usepackage{wrapfig}
- \usepackage{float}
- \usepackage{colortbl}
- \usepackage{pdflscape}
- \usepackage{tabu}
- \usepackage{threeparttable}
- \usepackage{threeparttablex}
- \usepackage[normalem]{ulem}
- \usepackage{makecell}  
---
---
references:
- id: fenner2012a
  title: One-click science marketing
  container-title: Nature Materials
  volume: 11
---

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

## Title

\begin{equation}
f\left(k\right)=\binom{n}{k}p^k\left(1-p\right)^{n-k} \label{eq:binom}
\end{equation}

You may refer to it using `\@ref(eq:binom)`, e.g., see Equation \@ref(eq:binom).
and not a nice citation! @fenner2012a


## Including Tables

You can also embed tables, for example:  \@ref(tab:tw)

```{r tw, echo=FALSE}
mytable
```

## References

其中 mytable 存储在 R 会话中并由

生成

mytable <- head(cars) %>% kable(format = "latex", 
                                booktabs = T, 
                                caption = "Demo Table", 
                                escape = F) %>%
kable_styling(latex_options = 'HOLD_position')

现在，这应该可以工作，但是当我使用

编织文档时

rmarkdown::render('C:\Users\john\Documents\bbv.Rmd')

table 的 cross-reference 不存在！我只看到 ??
并且 table 有这个奇怪的 #tab 东西 - 如何摆脱它？
目录在这里，虽然我没有要求它

有解决这些问题的想法吗？谢谢！

编辑：奇怪的 #tab 东西在重启后消失了。

Answer 1

问题是您在 R 块之外使用它是在违背 kable 的意图：

The kable() function will automatically generate a label for a table environment, which is the prefix tab: plus the chunk label.

https://bookdown.org/yihui/bookdown/tables.html

所以下面的解决方法绝对是有问题的。将文件 foo.Rmd 与

一起使用

---
output:
  bookdown::pdf_document2:
    toc: no
header-includes:
- \usepackage{float}
---

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


## Including Tables

You can also embed tables, for example:  \@ref(tab:tw)

```{r tw, echo=FALSE}
mytable
```

You can also embed tables, for example:  \@ref(tab:tw2)

```{r tw2, echo=FALSE}
mytable2
```

Referencing images is easier: \@ref(fig:plt)

```{r plt, echo=FALSE, fig.cap = 'hello', fig.height=3} 
myplot 
```

可以用第二个文件处理这个文件foo.R:

library(knitr)
library(kableExtra)
# add the label to the options that would normally be populated from the chunk options
opts_current$append(list(label = "tw"))
mytable <- head(cars) %>% kable(format = "latex", 
                                booktabs = T, 
                                caption = "Demo Table", 
                                escape = F) %>%
  kable_styling(latex_options = 'HOLD_position')
opts_current$restore()

opts_current$append(list(label = "tw2"))
mytable2 <- tail(cars) %>% kable(format = "latex", 
                                booktabs = T, 
                                caption = "Demo Table", 
                                escape = F) %>%
  kable_styling(latex_options = 'HOLD_position')
opts_current$restore()

myplot <- ggplot(cars, aes(x = dist, y = speed)) + geom_point()

rmarkdown::render("foo.Rmd")

原则上，你也可以在R提示符下执行这些命令，但我尽量不直接使用提示符。顺便说一句，我没有得到你的代码的 (#tab) 输出。

但是，我认为不违背 kable 的工作原理更有意义。我可以理解将数据操作与表示分离是有意义的。但是，从我的角度来看，创建 table 是演示。因此，我不会在外部创建 table，而是在外部创建数据。为了具体化，让我们使用一个文件 bar.Rmd:

---
output:
  bookdown::pdf_document2:
    toc: no
header-includes:
- \usepackage{float}
---

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

## Including Tables

You can also embed tables, for example:  \@ref(tab:tw)

```{r tw, echo=FALSE}
mydata %>% kable(format = "latex", 
                 booktabs = T, 
                 caption = "Demo Table", 
                 escape = F) %>%
  kable_styling(latex_options = 'HOLD_position')
```

连同一个文件bar.R:

# insert data processing here
mydata <- head(cars)
rmarkdown::render("bar.Rmd")

这给了我相同的输出，并且数据处理（最初！）与演示文稿分开。

如何在 rmarkdown 中交叉引用表格和图表？

how to cross reference tables and plots in rmarkdown?

r

r-markdown

bookdown

kableextra

kable