knitr(R)-如何不在HTML文件中嵌入图片? [英] knitr (R) - how not to embed images in the HTML file?

问题描述

这可能非常简单，但是我似乎在文档中找不到它.我不想在HTML文件本身中嵌入生成的图像.

This is probably very easy but I can't seem to find it in docs. I would like to not embed the generated images in the HTML file itself.

因此，基本上我希望knit2html()生成一个带有单独图像文件的HTML文件(然后将这些图像文件链接到HTML中的/在HTML中显示).基本行为是脚本将图像作为base64字符串嵌入.问题在于，在IE中，大图片不会显示(即似乎丢失了).知道如何将图像与HTML输出分开吗?

So basically I want knit2html() to produce a HTML file with seperate image files (which are then linked to / shown in the HTML). The basic behaviour is that the script embeds the images as a base64 string. The problem with this is that in IE, large images won't show up (i.e. appear to be missing). Any idea how I can seperate the images from the HTML output?

我的示例.Rmd文件('knit.Rmd'):

My example .Rmd file ('knit.Rmd'):

```{r}
plot(3)
```

和我的.R文件从中生成HTML:

And my .R file to generate the HTML from this:

library(knitr)

knit2html('knit.Rmd')

此示例生成一个以图为嵌入式base64字符串的HTML.

This example generates a HTML with the plot as an embedded base64 string.

推荐答案

如果查看knit2html帮助页面，则会看到:

If you look at the knit2html help page, you will see that :

This is a convenience function to knit the input markdown source and
call ‘markdownToHTML()’ in the ‘markdown’ package to convert the
result to HTML.

然后，您在markdownToHTML帮助页面上看到以下参数:

Then you look at the markdownToHTML help page and read that there is the following argument :

 options: options that are passed to the renderer.  see
           ‘markdownHTMLOptions’.

因此，您查看markdownHTMLOptions(仍然没有丢失吗?)，然后看到以下选项:

So you look at the markdownHTMLOptions (still not lost ?) and see the following option :

 ‘'base64_images'’ Any local images linked with the ‘'<img>'’ tag
      to the output HTML will automatically be converted to base64
      and included along with output.

使用以下命令，您应该在系统上看到默认选项:

With the following command, you should see the default options on your system :

R> markdownHTMLOptions(default=TRUE)
[1] "use_xhtml"      "smartypants"    "base64_images"  "mathjax"       
[5] "highlight_code"

因此，您可以尝试使用以下方式编织markdown文件:

So may be you can try to knit your markdown file with :

knit2html("knit.Rmd", options=c("use_xhtml","smartypants","mathjax","highlight_code"))

不过没有经过测试...

Not tested, though...

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