RMarkdown错误

[刘廿九]

最近学习数据挖掘课程，装好了RStudio，然后弄pandoc出了问题，望指教！

我是跟着这个作者安装的
https://www.jianshu.com/p/3a1d95f9965a


在没有安装pandoc之前，我现在cmd里试了一下pandoc -v ，居然有结果

C:\Users\DELL>pandoc -v
pandoc 1.19.2.1
Compiled with pandoc-types 1.17.0.4, texmath 0.9, skylighting 0.1.1.4
Default user data directory: C:\Users\DELL\AppData\Roaming\pandoc
Copyright (C) 2006-2016 John MacFarlane
Web:  http://pandoc.org
This is free software; see the source for copying conditions.
There is no warranty, not even for merchantability or fitness
for a particular purpose.

然后我就没再安装pandoc了，继续安装下面的miktex和rticles

但是我怕在RStudio点击knit之后，出了问题

processing file: test_rmarkdown01.Rmd
  |..........                                                            |  14%
  ordinary text without R code

  |....................                                                  |  29%
label: setup (with options) 
List of 1
 $ include: logi FALSE

  |..............................                                        |  43%
  ordinary text without R code

  |........................................                              |  57%
label: cars
  |..................................................                    |  71%
  ordinary text without R code

  |............................................................          |  86%
label: pressure (with options) 
List of 1
 $ echo: logi FALSE

  |......................................................................| 100%
  ordinary text without R code


output file: test_rmarkdown01.knit.md

"D:/Program Files/RStudio/bin/pandoc/pandoc" +RTS -K512m -RTS test_rmarkdown01.utf8.md --to latex --from markdown+autolink_bare_uris+tex_math_single_backslash --output test_rmarkdown01.tex --self-contained --highlight-style tango --pdf-engine xelatex --variable graphics --lua-filter "D:/Program Files/R/R-3.6.2/library/rmarkdown/rmd/lua/pagebreak.lua" --lua-filter "D:/Program Files/R/R-3.6.2/library/rmarkdown/rmd/lua/latex-div.lua" --variable "geometry:margin=1in" 

然后，经过一通查询后，我想可能是pandoc版本问题，于是我去官网下载了pandoc的最新版本，2.9几的那一版本，安装之后，我又pandoc -v，出现的还是1.9几的版本。

最诡异的是！！刚安装的pandoc是在C:\Users\DELL\AppData\Local这个路径下，cmd里查询的1.9几的那个版本给出的默认路径是在C:\Users\DELL\AppData\Roaming这里，而且C:\Users\DELL\AppData\Roaming这个路径里根本没有pandoc的文件夹！

有没有遇到一样问题的，太难受了！

[刘廿九]

好像是包更新的问题