title: How to perform arithmetic manipulations on numbers in Vim?
body: <p>If I have a data file with columns of numbers like</p>
  <pre><code>3.14
  0.42
  6.66
  </code></pre>
  <p>Is there a way from within Vim to manipulate these with operations such as addition, subtraction, and division? For instance, say I want to add 2.1 to each number in a column, how should I go about this?</p>
  <p>I can do it by piping to, for instance, an Awk script, but I would like to know if there is a builtin method, and I haven’t found anything in the help files.</p>