title: Write data to file with tabs
body: <p>I have files with information separated by tabs. I would like to append calculated values to each specific files and have tried to get the same format using the 'paste' command, but it separates a line instead of a tab. 
  The file looks like (with [tab] representing a tab):</p>
  
  <pre><code>text[tab]=[tab]value
  text[tab]=[tab]value
  </code></pre>
  
  <p>Creating a single line with tabs does not work using paste as it will print \t:</p>
  
  <pre><code>conv &lt;- paste("conversion", "=", (y[,2]/90.6),sep="\t")
  </code></pre>
  
  <p>But if I try to add tabs later using:</p>
  
  <pre><code>conv &lt;- paste("conversion", "=", (y[,2]/90.6),sep=",")
  write(conv, file = "data.dat", append = TRUE, sep = "\t")
  </code></pre>
  
  <p>"conv" comes on separate lines:</p>
  
  <pre><code>text[tab]=[tab]value
  text[tab]=[tab]value
  conversion
  =
  11.7991169977925
  </code></pre>
  
  <p>instead of in tabs (what I want):</p>
  
  <pre><code>text[tab]=[tab]value
  text[tab]=[tab]value
  conversion[tab]=[tab]11.80
  </code></pre>
  
  <p>I am sure there must be a very easy solution to this but I simply couldn't find out. Thanks!</p>