对于一些常规的报告，我一般是会写一个脚本来自动运行、生成格式化的模板。然后通过 R 的软件包 knitr 来实现自动化报告效果。这样可以十分方便的把数据分析与数据报告结合在一起，如果在分析端的脚本有变化，我们只需要把主要精力放在修改 R 脚本就可以了，而在报告端，在每次生成报告时会自动根据分析脚本生成的数据进行更新，从而完成「时时更新与可重复研究」的伟大目标。

比如，我们公司目前要求每周五收盘会，出具一份所有基金的净值报告文档。这个一方面要求数据保持与数据库的同步更新，二来还要求文档有一定的「逼格」。针对第一条，我本身在日常工作中就是使用 R 来处理各项数据分析，而对于第二条，以前我也系统性的学习过 LaTeX 这个排版届的「一股清流」。因此，自然而然的，我就使用 Rstudio 来完成这个常规化的工作了。

问题描述

可是，最近在新安装的 Rstudio 中运行原来的脚本，却出现一个奇怪的报错。我怀疑是 Rstudio 因为版本更新的问题，不再使用原来的部分 yaml 参数。下面我们来看看具体的报错：

/usr/bin/pandoc +RTS -K512m -RTS ReportingTemplate.utf8.md --to beamer --from markdown+autolink_bare_uris+ascii_identifiers+tex_math_single_backslash --output ReportingTemplate.tex --template backtesting_template.tex --table-of-contents --variable theme=SOCIB --highlight-style espresso --latex-engine pdflatex --self-contained --latex-engine=xelatex 
output file: ReportingTemplate.knit.md
! Fatal fontspec error: "cannot-use-pdftex"

!

! The fontspec package requires either XeTeX or LuaTeX.

!

! You must change your typesetting engine to, e.g., "xelatex" or

! "lualatex"instead of "latex" or "pdflatex".

!

! See the fontspec documentation for further information.

!

! For immediate help type H <return>.

!..
!

! The fontspec package requires either XeTeX or LuaTeX.

!

! You must change your typesetting engine to, e.g., "xelatex" or

! "lualatex"instead of "latex" or "pdflatex".

!

! See the fontspec documentation for further information.

!

! For immediate help type H <return>.

!..
! The fontspec package requires either XeTeX or LuaTeX.

!

! You must change your typesetting engine to, e.g., "xelatex" or

! "lualatex"instead of "latex" or "pdflatex".

!

! See the fontspec documentation for further information.

!

! For immediate help type H <return>.

!..
!

! You must change your typesetting engine to, e.g., "xelatex" or

! "lualatex"instead of "latex" or "pdflatex".

!

! See the fontspec documentation for further information.

!

! For immediate help type H <return>.

!..
! You must change your typesetting engine to, e.g., "xelatex" or

! "lualatex"instead of "latex" or "pdflatex".

!

! See the fontspec documentation for further information.

!

! For immediate help type H <return>.

!..
! "lualatex"instead of "latex" or "pdflatex".

!

! See the fontspec documentation for further information.

!

! For immediate help type H <return>.

!..
!

! See the fontspec documentation for further information.

!

! For immediate help type H <return>.

!..
! See the fontspec documentation for further information.

!

! For immediate help type H <return>.

!..
!

! For immediate help type H <return>.

!..
! For immediate help type H <return>.

!..
Error: Failed to compile ReportingTemplate.tex. See ReportingTemplate.log for more info.

In addition: There were 50 or more warnings (use warnings() to see the first 50)

Execution halted

解决思路

---
title: "汉云投资"
subtitle: "基金报告"
output: 
  beamer_presentation:
    theme: SOCIB      ## sthlm, SOCIB
    template: backtesting_template.tex
    pandoc_args: '--latex-engine=xelatex'
    keep_tex: false
    toc: true
    highlight: espresso  ## "default", "tango", "pygments", "kate", "monochrome", 
                        ## "espresso", "zenburn", "haddock"
date: cntoday
print: no
---

---
title: "汉云投资"
subtitle: "基金报告"
output: 
  beamer_presentation:
    theme: SOCIB      ## sthlm, SOCIB
    template: backtesting_template.tex
    # pandoc_args: '--latex-engine=xelatex'
    latex_engine: xelatex
    keep_tex: false
    toc: true
    highlight: espresso  ## "default", "tango", "pygments", "kate", "monochrome", 
                        ## "espresso", "zenburn", "haddock"
date: cntoday
print: no
---