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I am producing reports using rmarkdown. When knitting a PDF
--- title: "Untitled" output: pdf_document --- I would like to specify the font to be used in creating the PDF. The official documentation (see section "LaTeX Options) says I can do this. 
However, I've never used LaTeX and fail to understand how such selection can be made in YAML options at the top of the .Rmd document used by rmarkdown package.
sessionInfo() R version 3.1.0 (2014-04-10) Platform: x86_64-w64-mingw32/x64 (64-bit)
locale: [1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United States.1252 [3] LC_MONETARY=English_United States.1252 LC_NUMERIC=C [5] LC_TIME=English_United States.1252 attached base packages: [1] grid stats graphics grDevices utils datasets methods base other attached packages: [1] ggplot2_1.0.0 RODBC_1.3-10 knitr_1.6 dplyr_0.2 I've never used LaTeX and don't want to get into it at this very mom
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To change the font size, you don't need to know a lot of html for this. Open the html output with notepad ++. Control F search for "font-size". You should see a section with font sizes for the headers (h1, h2, h3,...).
The RMarkdown output is based on LaTeX, and the default LaTeX font is Computer Modern. You will need to download and install the font on your computer. The CMU Serif version of this font is probably the one you want.
To transform your markdown file into an HTML, PDF, or Word document, click the “Knit” icon that appears above your file in the scripts editor. A drop down menu will let you select the type of output that you want. When you click the button, rmarkdown will duplicate your text in the new file format.
Changing default font typeface The font can also be changed for a specific element in the document. The command \fontfamily{qcr}\selectfont will set the TeX gyre cursor font typeface, whose fontcode is qcr , for the text inside the braces. A lot more LaTeX font typefaces are available, see the reference guide.
The indentation in YAML options is meaningful. As the instructions point out "note that these options do not appear underneath the output section but rather appear at the top level along with title, author, etc.)". So,
--- output: pdf_document: latex_engine: xelatex sansfont: Calibri Light --- will produce an unused argument error, while
--- output: pdf_document: latex_engine: xelatex sansfont: Calibri Light --- will do the job. In addition, LaTeX commands inserted after YAML seem to override it: so
--- output: pdf_document: latex_engine: xelatex sansfont: Calibri Light --- \fontsize{12}{22} \fontseries{b} \selectfont produces the PDF with default font, not Calibri, however, the font option is passed fine.
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