如何使用中文？

[xuefliang]

CTeX能够正常使用中文，需要在其他模板如 Journal of Statistical Software中使用中文，改如何做？

---
author:
  - name: FirstName LastName
    affiliation: University/Company
    address: >
      First line
      Second line
    email: name@company.com
    url: http://rstudio.com
  - name: Second Author
    affiliation: Affiliation
title:
  formatted: "A Capitalized Title: Something about a Package \\pkg{foo}"
  # If you use tex in the formatted title, also supply version without
  plain:     "A Capitalized Title: Something about a Package foo"
  # For running headers, if needed
  short:     "\\pkg{foo}: A Capitalized Title"
abstract: >
  The abstract of the article.
keywords:
  # at least one keyword must be supplied
  formatted: [keywords, not capitalized, "\\proglang{Java}"]
  plain:     [keywords, not capitalized, Java]
preamble: >
  \usepackage{amsmath}
output: rticles::jss_article
documentclass: ctexart

---

# 中文 Introduction

提示：
! Undefined control sequence.
\GenericError  ...                                
                                                    #4  \errhelp \@err@     ...
l.42 \section{中文 Introduction}

pandoc: Error producing PDF from TeX source
Error: pandoc document conversion failed with error 43
Execution halted

[yihui]

目前来说我估计不大可能，首先documentclass: ctexart对JSS模板来说毫无用处，因为模板中的文档类已经被写死了：https://github.com/rstudio/rticles/blob/master/inst/rmarkdown/templates/jss_article/resources/template.tex 其次，中文文档十之八九需要通过xelatex编译，JSS模板默认是pdflatex编译。

第一个问题也许可以通过在导言区插入\usepackage{ctexcap}解决，至于第二个问题，因为jss_article()不接受参数，所以无法设置LaTeX引擎，你只能自定义函数和模板了。

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