由Pandoc从.md转换的投影仪幻灯片中的图非常大 [英] Plots in beamer slides converted from .md by pandoc are extremely large

问题描述

由R chunks在R markdown文件中生成的法线图在转换为html幻灯片或pdf时完全存在.但是，当它们由pandoc -t beamer ex.md -V theme:Warsaw -o beamer.pdf 转换为投影仪幻灯片时，图变得非常大，尤其是对于par(mfrow=c(n,m))生成的图而言，在这种情况下，只显示了一小部分图.

Normal plots generated by R chunks in R markdown files are exactly there when converted to html slides or pdf. However, when they are converted to beamer slides by pandoc -t beamer ex.md -V theme:Warsaw -o beamer.pdf , the plots become extremely large, especially for those generated by par(mfrow=c(n,m)), in which case only a little part of the plot is displayed.

我试图通过设置块选项dev='pdf'进行修复，但无法解决问题.

I tried to fix by setting the chunk option dev='pdf', but it doesn't work out.

html中的图是

The plot in html is

Beamer中的情节是

The plot in beamer is

推荐答案

pandoc的开发版本在投影仪模板中包含一些代码，这些代码应将图像缩放到幻灯片的宽度.这可能对您有帮助.

The development version of pandoc includes some code in the beamer template that should scale images to the width of the slide. That may help in your case.

您无需安装开发pandoc即可使用它，因为更改仅是模板.只需使用pandoc -D beamer > my.beamer生成默认投影仪模板的副本即可.在\usepackage{graphicx}行之后将以下行插入my.beamer:

You don't need to install development pandoc to use this, since the change is just to a template. Just generate a copy of the default beamer template using pandoc -D beamer > my.beamer. Insert the following lines into my.beamer after the line \usepackage{graphicx}:

\makeatletter
\def\ScaleIfNeeded{%
  \ifdim\Gin@nat@width>\linewidth
    \linewidth
  \else
    \Gin@nat@width
  \fi
}
\makeatother
\setkeys{Gin}{width=\ScaleIfNeeded}

然后将pandoc与选项--template=my.beamer一起使用.

Then use pandoc with the option --template=my.beamer.

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