I\'ve previously asked about the commands for converting R Markdown to HTML.
What is a good way to convert R Markdown files to PDF documents?
Right now (August 2014) You could use RStudio for converting R Markdown to PDF. Basically, RStudio use pandoc to convert Rmd to PDF.
You could change metadata to:
For more details - http://rmarkdown.rstudio.com/pdf_document_format.html