Rmarkdown and Latex format citations with round paranthesis

user_7448827 0
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I feel like this is a straight forward thing, but everything I find doesn't quite get me what I want. I'm using rmarkdown and knitting to a latex .pdf. I'd like to have my in-text citations have round () parenthesis instead of the block ones. The yaml below uses a references.bib file to correctly import the references. Is there anything I can do to easily change my parenthesis to round?

---
title: "Title"
author: "Author"
date: "16/03/2020"
output: 
  pdf_document:
    fig_caption: yes
    citation_package: natbib
  bibliography: references.bib  
editor_options: 
  chunk_output_type: console
---

I've used an approach here, but it returns an error: 

Error in yaml::yaml.load(..., eval.expr = TRUE) : 
  Parser error: while parsing a block mapping at line 6, column 5 did not 
  find expected key at line 7, column 30`

    ---
    title: "Title"
    author: "Author"
    date: "16/03/2020"
    output: 
      pdf_document:
        fig_caption: yes
      bibliography: references.bib  
    editor_options: 
      chunk_output_type: console
    \usepackage[round]{natbib}
    ---

Any ideas? Thanks for your suggestions / ideas...

citations r-markdown r latex
2 Answers

The problem with your attempt to include \usepackage[round]{natbib} in the rmarkdown header is that rmarkdown seems not clever enough to parse commands with optional arguments. One can trick it by hiding the command in a .tex file

---
title: "Title"
author: "Author"
date: "16/03/2020"
output: 
  pdf_document:
    fig_caption: yes
    includes:
      in_header: preamble.tex
bibliography: references.bib  
---

test [@knuth]

with preamble.tex

\usepackage[round]{natbib}

enter image description here

https://rstudio.cloud/project/1061588

user_27770740

Using the header-includes: option should fix the issue.

---
title: "Title"
author: "Author"
date: "16/03/2020"
output: 
  pdf_document:
    fig_caption: yes
    citation_package: natbib
  bibliography: references.bib  
editor_options: 
  chunk_output_type: console
header-includes:
    - \usepackage[round]{natbib}
---
user_6436330
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