如何在 R markdown (bookdown) 中添加子图

Question

我正在尝试在 R bookdown 项目中添加带有子标题的图形，如下所示

---
output:
  pdf_document:
    extra_dependencies: "subfig"
---
     
```{r  echo=F, out.width = "50%",fig.showtext=TRUE,fig.show='hold',fig.cap="TITULO"}
par(mfrow=c(1,2))
knitr::include_graphics("ts_mult.png") 
knitr::include_graphics("ts_ad.png") 
```

我得到以下结果

然后我尝试添加子标题（“imagen a”，“imagen b”），如下所示

```{r  echo=F, out.width = "50%",fig.showtext=TRUE,fig.show='hold',fig.cap="TITULO",fig.subcap=c("imagen a", "imagen b")}
par(mfrow=c(1,2))
knitr::include_graphics("ts_mult.png") 
knitr::include_graphics("ts_ad.png") 
```

但这不起作用，并引发以下错误

! Undefined control sequence.
<recently read> \subfloat 

Error: LaTeX failed to compile Tesis_AE.tex. See https://yihui.org/tinytex/r/#debugging for debugging tips.

如何正确添加子标题？

Answer 1

您只需添加fig.subcap=c("A subtitle","Another subtitle")块即可。

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至少在我的环境中，这fig.showtext=TRUE是不必要的，而且这会导致错误：Error in loadNamespace(name) : there is no package called \'showtext\' Calls: <Anonymous> ... loadNamespace -> withRestarts -> withOneRestart -> doWithOneRestart Execution halted。这就是为什么我在答案中排除了该设置。

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---\noutput:\n  pdf_document:\n    extra_dependencies: "subfig"\n    keep_tex: yes\n---\n     \n```{r echo=F, out.width = "50%",fig.show=\'hold\',fig.cap="TITULO", fig.subcap=c("Subtitulo1","Subtitulo2")}\npar(mfrow=c(1,2))\nknitr::include_graphics("your-path-to/image1.png") \nknitr::include_graphics("your-path-to/image2.png") \n```\n

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会议信息

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> sessionInfo()\nR version 4.0.2 (2020-06-22)\nPlatform: x86_64-w64-mingw32/x64 (64-bit)\nRunning under: Windows 10 x64 (build 18362)\n\nMatrix products: default\n\nlocale:\n[1] LC_COLLATE=Japanese_Japan.932  LC_CTYPE=Japanese_Japan.932    LC_MONETARY=Japanese_Japan.932\n[4] LC_NUMERIC=C                   LC_TIME=Japanese_Japan.932    \n\nattached base packages:\n[1] stats     graphics  grDevices utils     datasets  methods   base     \n\nloaded via a namespace (and not attached):\n[1] compiler_4.0.2 tools_4.0.2   \n\n> rmarkdown::pandoc_version()\n[1] \xe2\x80\x982.7.3\xe2\x80\x99\n

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