Centre a plot to the middle of a page using Knitr

Question

I\'d like to align a plot to the center of a page of a knitr-generated pdf document. I can horizontally align the plot to the center using fig.align=\'center\' but

Answer 1

On the LaTeX side, a vertically centered figure must be a figure with position p. How this can be achieved using knitr depends:

• If the figure has a caption, it is placed in a figure environment (see fig.env). Then only the additional option fig.pos = 'p' is needed.

• If the figure has no caption (which is usually bad), you can manually add the figure environment:

  \begin{figure}[p]
  
  ```{r,fig.align='center',out.extra='angle=90', echo=FALSE}
  
  library(ggplot2)
  ggplot(diamonds, aes(y=carat, x=price, colour=clarity))+geom_point()+
  facet_wrap(~cut)
  
  ```
  \end{figure}
  

Note that this works when compiling to PDF but restricts you to PDF as output format.