Argthtjtr

Hello guys I'm trying so hard to make a document in greek with Rmarkdown, cause I dont want to learn all the Latex commands and it's very easy to actually make a document that seems like a Latex document with Rmarkdown. Really my only problem is the language. I've got so many errors and I've managed to handle them until now. Bellow I give you a simple example of what Rstudio produces. The problem is that it doesn't print any greek letter but no error occured. I really dont know what's going on.

---

title: "Title"

author: "Me"

fontsize: 12pt

header-includes:

   - usepackage{fontspec}  

   - usepackage[english,greek]{babel}

   - newcommand{en}{selectlanguage{english}}

   - newcommand{gr}{selectlanguage{greek}}



output:

   pdf_document:

      latex_engine: xelatex

---





{gr{Αυτά είναι ελληνικά}}    

I'm using tinytex in Rstudio with session info :

R version 3.5.0 (2018-04-23)

Platform: x86_64-w64-mingw32/x64 (64-bit)

Running under: Windows 7 x64 (build 7601) Service 

Pack 1



Matrix products: default



locale:

[1] LC_COLLATE=Greek_Greece.1253  

LC_CTYPE=Greek_Greece.1253    

LC_MONETARY=Greek_Greece.1253

[4] LC_NUMERIC=C                  

LC_TIME=Greek_Greece.1253    



attached base packages:

[1] stats     graphics  grDevices utils     

datasets  methods   base     



loaded via a namespace (and not attached):

[1] compiler_3.5.0  backports_1.1.2 magrittr_1.5    

rprojroot_1.3-2 htmltools_0.3.6

[6] tools_3.5.0     yaml_2.2.0      Rcpp_0.12.18    

stringi_1.2.4   rmarkdown_1.10 

[11] knitr_1.20      stringr_1.3.1   digest_0.6.15   

evaluate_0.11 

It is crucial that you use a font that actually contains Greek glyphs.
The following works for me when the input document is saved in UTF-8:

---

header-includes:

   - usepackage[english,greek]{babel}

   - newcommand{en}[1]{{selectlanguage{english}#1}}

   - newcommand{gr}[1]{{selectlanguage{greek}#1}}

mainfont: GFS Didot

output:

   pdf_document:

      latex_engine: xelatex

---





gr{Αυτά είναι ελληνικά}   en{The gick brown fox jumps over the lazyy dog.}

I removed usepackage{fontspec}, since that is done automatically when xelatex is used. I have also updated your language switching commands to take an argument, since pandoc does not like the {command text} style.

However, it would be more conventional to combine xelatex with polyglossia instead of babel. That's what pandocdoes when you use the lang feature:

---

lang: el

mainfont: GFS Didot

output:

   pdf_document:

      latex_engine: xelatex

---





Αυτά είναι ελληνικά [the quick brown fox jumps over the lazy dog]{.class lang="en"}



Αυτά είναι ελληνικά



::::: {.class lang="en"}



Here is a paragraph.



And another.



:::::



Αυτά είναι ελληνικά

Note that you might have to update fontspec/mathspec/polyglossia to avoid this problem.

First of all thank you for your immediate response, and your advices are much appreciated. Well I tried to update the packages you said via the tlmgr_update() command (from tinytex package), I copy-pasted your last code and the error below is produced:

processing file: untitled.Rmd

output file: untitled.knit.md



! Package fontspec Error: The font "GFS Didot" cannot be 

found.



Error: Failed to compile untitled.tex. See untitled.log for 

more info.

Execution halted

I even did tlmgr_update("GFS") cause I saw that the font you used was from this package.