title: Create Heatmap in R for 3 variables
body: <p>I have a CSV file with 3 variables (Job Time - V1, Job Size - V2 and Wait time - V3). Although there might not be an entry for Every pair of (V1 vs V2). How do I create a heatmap like the one attached (although I'd prefer R, any other language or framework works as well)? </p>
  
  <p>My data looks like this (Has 3 million entries): V1, V3 - seconds, V2 - number</p>
  
  <pre><code>V1      V2    V3
  1135    10    9
  1071    10    7
  4502    12    591
  1087    10    7
  1948    12    9
  3445    16    8
  9521    16    8
  9115    16    9
  30525   16    8
  29522   16    10
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/6sp4O.png" rel="nofollow noreferrer">HeatMap</a></p>
  
  <p>Any help is highly appreciated!</p>