title: How to determine the delta between values at similar but not equal coordinates?
body: <p>I have two matrices of unequal length. Each matrix contains coordinates in one column and values associated to those coordinates in the second column.<br>
  The range of coordinates is similar in both cases, however, the coordinates are not exactly the same.<br>
  I want to find the delta between the values of the first and the second matrix. How do I overcome the issue of different coordinates?</p>