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而以下最小示例适用于output: html_document它,但不适用于output: ioslides_presentation.
任何想法为什么?

 ---
 title: "Tikz test"
 output: ioslides_presentation
 ---

 ## Tikz Example

 ```{r,engine='tikz', fig.ext='svg'}
 \begin{tikzpicture}
  \draw (0,0) circle (2cm);
 \end{tikzpicture}
 ```
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