title: How do I perform mathematical operations between values in two columns of an R data frame based on their position?
body: <p>I'm working on an R project where I'm trying to compare frequencies their respective values. Essentially I have a 11852X3 column data frame with position number in slot 1, a unique value ranging from 1-11852 in the second column, and then the same set of unique values just in different positions in column 3. </p>
  
  <p>Essentially because the values in columns 2 and 3 have overlap I want to find the difference between these two values based on the position number (1st) column on the far left and store it in another data frame. So if the the second column has the value 2017 in position one and then the third column also has 2017 in position one, the new data frame would have an entry of 2017 and then a value of 0 since they have the same position. If column 2 has a value of 5276 in the second position, and column 3 has the value 5276 in position 73 then the new data frame would have a value of 70.</p>
  
  <p>I would love some guidance as to the way on how to do this. Thanks.</p>