Define knitr options for an R Markdown output format that creates PDF output.

knitr_options_pdf(fig_width, fig_height, fig_crop, dev = "pdf")

## Arguments

fig_width

Default width (in inches) for figures

fig_height

Default height (in inches) for figures

fig_crop

Whether to crop PDF figures with the command pdfcrop. This requires the tools pdfcrop and ghostscript to be installed. By default, fig_crop = TRUE if these two tools are available.

dev

Graphics device to use for figure output (defaults to png)

## Value

An list that can be passed as the knitr argument of the

output_format function.