使用knitr :: include_graphics()在RStudio笔记本中包含图像 [英] Include images in RStudio notebook with knitr::include_graphics()

问题描述

我对即将推出的RStudio笔记本电脑感到非常兴奋(可在预览版中找到) RStudio .有关简短概述，请点击此处).但是，我在包含图片时遇到了一些困难.

I am quite excited about the upcoming RStudio notebooks (available in the preview version of RStudio. For a short overview click here). However, I am encountering some difficulties with including images.

在Rmarkdown中，我可以包含以下图像:

In Rmarkdown, I can include images like this:

--- 
title: "This works"
output: html_document
---

```{r echo=FALSE, out.width='10%'}
library(knitr)
knitr::include_graphics('https://www.rstudio.com/wp-content/uploads/2014/06/RStudio-Ball.png')
```

但是，当我想在笔记本上做同样的事情时(请注意从html_document更改为html_notebook)，我将不再获得图像:

However, when I want to do the same in a notebook (note the change from html_document to html_notebook), I no longer get an image:

--- 
title: "This does not work"
output: html_notebook
---

```{r echo=FALSE, out.width='10%'}
knitr::include_graphics('https://www.rstudio.com/wp-content/uploads/2014/06/RStudio-Ball.png')
```

(当我在与笔记本相同的文件夹中使用图像时，仅获得该图像的名称，就像指向外部图像的链接一样).

(When I use an image in the same folder as my notebook, I simply get the name of that image, just as is the case with the link to the external image).

我的问题:有没有办法在rmarkdown代码块内的笔记本(更新:)中显示图像?

请注意:我想使用R代码包含图片.我不想包含带有标准markdown(![image description](path/to/image))的图像，该图像在笔记本和常规rmarkdown文档中均可使用.我也不想使用html.我希望使用r代码包含图像可以在笔记本中呈现图像.

Please note: I want to use r-code to include the image. I do not want to include images with standard markdown (![image description](path/to/image)), which works in both the notebook and the regular rmarkdown document. I also do not want to use html. My hope would be that using r-code to include the image would render the image in the notebook.

编辑:常规Rmarkdown文件和笔记本之间的区别是笔记本是预览版"而不是编织版:

Edit: One difference between regular Rmarkdown files and notebooks is that notebooks are "previewed" and not knit:

推荐答案

感谢您抽出宝贵的时间试用笔记本.您今天可以通过一种环岛的方式来做到这一点.只需绘制一个图并在其上绘制图像即可.

Thanks for taking the time to try out the notebooks. There is a roundabout way you can do this today; just make a plot and draw the image on it.

download.file("https://www.rstudio.com/wp-content/uploads/2014/06/RStudio-Ball.png", "RStudio-Ball.png")
library("png")
ball <- readPNG("RStudio-Ball.png", native = TRUE)
plot(0:1, 0:1, type = "n", ann = FALSE, axes = FALSE)
rasterImage(ball, 0, 0, 1, 1)

但是，这有点骇人听闻，所以我们只添加了对knitr::include_graphics的支持.它将是明天的每天(0.99.1272或更高版本).

It's a bit of a hack, though, so we just added support for knitr::include_graphics. It'll be in tomorrow's daily (0.99.1272 or later).

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