This operation is critical for anyone wishing to produce Markdown files in APA format since table captions are typically left-justified.
I'm going to clarify Robin's answer a little bit because, because totally new to the Markdown/Latex interface, it took me some time to figure out.
Upload the "caption" package (documentation available here) by including the
\usepackage{caption}
command in YAML (header) part of the document, preceded by
header-includes:
So an an entire YAML section at the header of the document might look like this:
---
title: "Supplementary Materials"
author: ""
date: "3/30/2018"
output:
pdf_document: default
editor_options:
chunk_output_type: inline
header-includes:
- \usepackage{caption}
---
Then, at any point in the document, before a code chunk (in its own white space), you can insert the code:
\captionsetup{justification = raggedright, singlelinecheck = false}
To change the settings back again, you can re-insert this code at any point in white space of the Markdown file (not in a code chunk!)
E.g.
\captionsetup{justification = centering, singlelinecheck = false}
align
argument? – Roman Luštrikprint.xtable
for some arguments which might help you position the caption. – Roman Luštrik