title: Split a character vector into individual characters? (opposite of paste or stringr::str_c)
body: <p>An incredibly basic question in R yet the solution isn't clear.</p>
  
  <p>How to split a vector of character into its individual characters, i.e. the opposite of <code>paste(..., sep='')</code> or <code>stringr::str_c()</code> ?</p>
  
  <p>Anything less clunky than this:</p>
  
  <pre><code>sapply(1:26, function(i) { substr("ABCDEFGHIJKLMNOPQRSTUVWXYZ",i,i) } )
  "A" "B" "C" "D" "E" "F" "G" "H" "I" "J" "K" "L" "M" "N" "O" "P" "Q" "R" "S" "T" "U" "V" "W" "X" "Y" "Z"
  </code></pre>
  
  <p>Can it be done otherwise, e.g. with <code>strsplit()</code>, <code>stringr::*</code> or anything else?</p>