title: R: Unicode characters in data frame names
body: <p>In R for Windows I can assign a unicode character as follows:</p>
  
  <pre><code>(u &lt;- "\U0444")
  # [1] "ф"
  </code></pre>
  
  <p>However, assigning the string to a data frame gives an unreadable output:</p>
  
  <pre><code>x &lt;- data.frame(1)
  setNames(x,u)
  #   &lt;U+0444&gt;
  # 1        1
  </code></pre>
  
  <p><em>Session Info</em></p>
  
  <pre><code>R version 3.4.0 (2017-04-21)
  Platform: x86_64-w64-mingw32/x64 (64-bit)
  Running under: Windows 10 x64 (build 15063)
  locale:
  [1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United States.1252    LC_MONETARY=English_United States.1252
  [4] LC_NUMERIC=C                           LC_TIME=English_United States.1252    
  </code></pre>