title: How can I specify which columns to select using read.table in R
body: <p>I have a dataset with 100 columns and it doesn't have a header.</p>
  
  <p>I have an int vector that consists of some numbers ranges between 1 to 100. For example, a vector with "2 5 62 78".</p>
  
  <p>Now when I read the dataset using read.table, all I want is to select column 2, 5, 62 and 78 from the dataset. How can I do that? Many thanks.</p>