Can't use both fig.pos and out.width/height in knitr? - latex

Question

I am using the bookdown package to build my pdf. Here is my _output.yml:
## Here to create the pdf
bookdown::pdf_book:
extra_dependencies: ["float"]
toc: true
template: _assets/template.tex
mainmatter: true
includes:
in_header: _assets/preamble.tex
latex_engine: lualatex
keep_tex: yes
citation_package: natbib
When I use only fig.pos = "!H" or out.height="75%", the knitting works.
However, I'd like to use both fig.pos = "!H" and out.height="75%" (for instance {r fig, fig.cap="Caption", out.height="75%", fig.pos = "!H"}) but when I do so, I have:
! LaTeX Error: Unknown float option `H'.
I checked and the package float is correctly installed.

Answer 1

There is nothing that prevents fig.pos and out.height from being used a the same time. If I evaluate the code below:
---
title: "R Notebook"
output: latex_fragment
---
```{r fig, fig.cap="Caption", out.height="75%", fig.pos = "!H"}
library(ggplot2)
ggplot()+ theme_minimal()
```
I get the following latex output:
\begin{figure}[!H]
\includegraphics[height=0.75\textheight]{TestX_files/figure-latex/fig-1} \caption{Caption}\label{fig:fig}
\end{figure}
Which is what you'd expect with the options given (note the 0.75\textheight and the [!H])
The error comes from the package float not being available. To properly produce a pdf with fig.pos options, add the following:
---
output:
pdf_document :
extra_dependencies: ["float"]
---
as explained here