How can I insert an image from internet to the pdf file produced by R bookdown in a smart way?
问题 As far as I know, inserting an image from internet to LaTeX is not possible. You have to download the image first, and then include it locally. With R bookdown, I do it like this: download.file('https://bookdown.org/yihui/bookdown/images/cover.jpg','cover.jpg', mode = 'wb') knitr::include_graphics('cover.jpg') It works very well for both the gitbook and pdf outputs. But I do not think it is smart. It is necessary for pdf to download the file first, but unnecessary for gitbook output. The