R plot title encoding in Pdf

Question

This question is related to: Rhtml: Warning: conversion failure on '<var>' in 'mbcsToSbcs': dot substituted for <var> and R doesn't open with UTF-8

I use Ubuntu, I can not show a turkish character, ı, on the title of a plot:

myScript.r:

pdf(file='/home/sait/Desktop/abc.pdf')
plot(1:7,1:7,main='geziparkı')

I am having the following warning messages when I run the script using Rscript myScript.r,

Warning messages:
1: In title(...) :
  conversion failure on 'geziparkı' in 'mbcsToSbcs': dot substituted for <c4>
2: In title(...) :
  conversion failure on 'geziparkı' in 'mbcsToSbcs': dot substituted for <b1>
3: In title(...) :
  conversion failure on 'geziparkı' in 'mbcsToSbcs': dot substituted for <c4>
4: In title(...) :
  conversion failure on 'geziparkı' in 'mbcsToSbcs': dot substituted for <b1>

I added the line pdf.options(encoding='ISOLatin2.enc') on the top of my script as mentioned in the related previous questions, did not help.

Do I need to change something from my locale settings of Ubuntu. My sessioinInfo() is following,

> sessionInfo()
R version 2.15.2 (2012-10-26)
Platform: x86_64-pc-linux-gnu (64-bit)

locale:
 [1] LC_CTYPE=tr_TR.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=tr_TR.UTF-8        LC_COLLATE=tr_TR.UTF-8    
 [5] LC_MONETARY=tr_TR.UTF-8    LC_MESSAGES=C             
 [7] LC_PAPER=C                 LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=tr_TR.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base   

PS: I continue investigating this issue, and realized that if I use .png, it works perfectly, only problem is with .pdf.

Answer 1

I finally found the solution,

Substituting pdf(file='/home/sait/Desktop/abc.pdf') with cairo_pdf('/home/sait/Desktop/abc.pdf', family="DejaVu Sans") did the trick.

I do not know what this actually done, however I have tried a lot of stuff and nothing has worked except this one.