Spanish accents disappear from figures but show up properly on paragraphs

[Sebastian Velez]

---
title: 'Some title'
author: 'This be me'
date: '`r format(Sys.Date(), "%B %Y")`'
lang: es
header-includes: 
  - \usepackage{tikz}
output: 
  pdf_document:
    fig_caption: yes
---


```{r global options, echo = F, message=F}
library(knitr)
opts_chunk$set(fig.width=6, fig.height=3.5, dev = 'tikz')
```

I have some paragraphs that include cool accents like áspid. 

If I run the next chunk in the R console I see the accent on the figure it generated. But the accent is 
missing in the pdf. 


```{r}
plot(pressure, main= "áspid")
```

[Kirill Müller]

Thanks. Can you please install the development version and show the output of tikzDevice::tikzTest() ?

[Cristian E. Nuno]

After reading an answer to this particular Stack Overflow post - Producing pdf with knitr and Rmarkdown: accents in text show up but not in figures. - it seems that this question was double posted.

Here is how I took the advice from Stack Overflow to resolve @sebastianvelez's issue:

---
title: 'Some title'
author: 'This be me'
date: '`r format(Sys.Date(), "%B %Y")`'
lang: es
output: 
  pdf_document:
    fig_caption: yes
---


```{r global options, echo = FALSE, message = FALSE}
# install this particular package from GitHub
devtools::install_github( repo = "daqana/tikzDevice" )

# load necessary packages
library( knitr )
library( tikzDevice )

# requesting xelatex instead of the default LaTeX engine does seem to work
# thank you to SO for this answer 
# https://stackoverflow.com/a/46220592/7954106
options( tikzDefaultEngine = "xetex" )

# set figure dimensions
opts_chunk$set( fig.width = 6, fig.height = 3.5 )

I have some paragraphs that include cool accents like áspid.

If I run the next chunk in the R console I see the accent on the figure it generated. But the accent is
missing in the pdf.

plot( x = pressure, main = "áspid" )

[Nico Bellack]

Hi @sebastianvelez, using options( tikzDefaultEngine = "xetex" ) should indeed solve this, thanks @cenuno!

Closing this issue since it appears to be resolved. Please feel free, if this is still an issue, to leave a comment requesting this issue be reopened.