当fig.retina不是1时，如何在R Markdown中保留数字标题

I'm having trouble with figure captions in html documents generated using R Markdown. If I don't specify the fig.retina option, or if I set it to 1, the output document has a figure caption. If I set it to a value that isn't 1, however, the future caption is missing but the text for it is present as the alt text for the figure. How can I keep the figure captions?

我在使用R Markdown生成的html文档中遇到数字标题时遇到问题。如果我没有指定fig.retina选项，或者我将其设置为1，则输出文档具有数字标题。但是，如果我将其设置为不是1的值，则会丢失未来的标题，但其文本将作为图形的替代文本显示。如何保留数字标题？

An example:

一个例子：

---
title: "Example"
output:
  html_document:
    fig_caption: yes
    fig_retina: 2
---


Text text text

```{r fig.cap="Figure 1. Some random numbers"}
plot(rnorm(25),runif(25)) 
```

Renders to give a document with no figure caption, but if I change the value for fig.retina to 1 I get a figure caption. The same thing happens if I set fig.retina in the chunk rather than globally.

渲染给出一个没有图形标题的文档，但如果我将fig.retina的值更改为1，我会得到一个数字标题。如果我在块中设置fig.retina而不是全局，则会发生同样的事情。

1 个解决方案

#1

Here is the relevant documentation

这是相关文档

#' @param fig_retina Scaling to perform for retina displays (defaults to 2 when
#'   \code{fig_caption} is \code{FALSE}, which currently works for all widely
#'   used retina displays). Set to \code{NULL} to prevent retina scaling. Note
#'   that this will always be \code{NULL} when \code{keep_md} is specified (this
#'   is because \code{fig_retina} relies on outputting HTML directly into the
#'   markdown document).
#' @param fig_caption \code{TRUE} to render figures with captions

So if you don't specify the default will be 2. I did find that if I changed your code to

因此，如果你没有指定默认值将是2.我确实发现如果我将代码更改为

---
title: "Example"
output:
  html_document:
    fig_caption: yes

---


Text text text

```{r fig.cap="Figure 1. Some random numbers"}
plot(rnorm(25),runif(25)) 
```

It showed the caption.

它显示了标题。

update

更新

After looking around a bit I found this

环顾四周后我发现了这个

Note the chunk option fig.retina=1: without it, rmarkdown::render() will generate plots for Retina displays, which means the plots are written in raw <img> tags instead of ![](), and Pandoc will not be able to generate figure captions in that case.

注意块选项fig.retina = 1：没有它，rmarkdown :: render（）将生成Retina显示的图，这意味着图是用原始标签而不是！[]（）编写的，并且Pandoc不会在这种情况下能够生成数字标题。

So probably you need to just use normal markdown for adding html for the caption.

因此，您可能需要使用正常的降价来为标题添加html。

#1