HTML 中的 Knitr 和图说明

Question

knitr 将参数 fig.cap 定义为

fig.cap: (NULL; character) figure caption to be used in a figure environment in LaTeX (in \caption{}); if NULL or NA, it will be ignored, otherwise a figure environment will be used for the plots in the chunk (output in \begin{figure} and \end{figure})

然而，对于 HTML 输出以下作品：

---
title: "Caption Test"
author: "Some Author"
date: "February 18, 2016"
output: html_document
---

```{r}
library(ggplot2)
```

```{r, fig.cap = c("This is caption 1", "This is caption 2")}
## Plot 1
qplot(carat, price, data = diamonds)

## Plot 2
qplot(carat, depth, data = diamonds)
```

意思是，每个数字都有其在代码块参数中定义的正确标题 fig.cap = c("Caption 1", "Caption 2")

但是，当字幕被放置在块选项中时，跟踪字幕是一项挑战 - 特别是如果很长的话。除了为每个图形创建两个单独的块并在块外插入标题外，还有其他选择吗？

Answer 1

您可以设置 eval.after="fig.cap"，以便在块运行之后 评估图形标题。这样，您就可以在块内定义字幕。

--- title: "Caption Test" author: "Some Author" date: "February 18, 2016" output: html_document --- ```{r} library(ggplot2) library(knitr) opts_knit$set(eval.after = 'fig.cap') ``` ```{r, fig.cap = cap} ## Plot 1 qplot(carat, price, data = diamonds) cap <- "This is caption 1" ## Plot 2 qplot(carat, depth, data = diamonds) cap <- c(cap, "This is caption 2") ```

HTML 中的 Knitr 和图说明

Knitr and Figure Caption in HTML

r

ggplot2

knitr

r-markdown