title: Edit Vim windows size dynamicaly with a hotkey
body: <p>In the vimrc file you can set the number of colums and lines you want your windows to be with the commands:</p>
  
  <pre><code>set columns=*
  set lines=*
  </code></pre>
  
  <p>But how can I dynamicaly edit that. Like having a mapped hotkey that for example increase the value of one of them or decrease the value of one of them. </p>
  
  <p>For example: </p>
  
  <pre><code>set colums=80
  &lt;C-B&gt; 
  </code></pre>
  
  <p>and then the columns number value is 81</p>
  
  <p>(The question isn't about 'nnoremap' but the command that can increase the value)</p>