title: read.csv() in R does not produce a vector
body: <p>I am trying to load data.csv in R using</p>
  
  <pre><code>S&lt;-read.csv(file="data.csv")
  </code></pre>
  
  <p>Since it is a single column of numbers (I believe tab deliminated) without header, I was hoping for S to be a vector. But S displays as</p>
  
  <pre><code>    X40.87
  1    40.69
  2    40.94
  ...   ...
  </code></pre>
  
  <p>(The numbers 40.87,40.69... are my numbers.).
  To access the third number, I need to invoke S[2,1]. Why not S[3]?</p>