include_graphics {knitr}R Documentation

Embed external images in knitr documents

Description

When plots are not generated from R code, there is no way for knitr to capture plots automatically. In this case, you may generate the images manually and pass their file paths to this function to include them in the output. The major advantage of using this function is that it is portable in the sense that it works for all document formats that knitr supports, so you do not need to think if you have to use, for example, LaTeX or Markdown syntax, to embed an external image. Chunk options related to graphics output that work for normal R plots also work for these images, such as out.width and out.height.

Usage

include_graphics(path, auto_pdf = TRUE)

Arguments

path

a character vector of image paths

auto_pdf

whether to use PDF images automatically when the output format is LaTeX, e.g. ‘foo/bar.png’ will be replaced by ‘foo/bar.pdf’ if the latter exists; this can be useful since normally PDF images are of higher qualities than raster images like PNG when the output is LaTeX/PDF

Value

The same as the input character vector path but it is marked with special internal S3 classes so that knitr will convert the file paths to proper output code according to the output format.

Note

This function is supposed to be used in R code chunks or inline R code expressions. You are recommended to use forward slashes (/) as path separators instead of backslashes in the image paths.


[Package knitr version 1.12.3 Index]