title: Is there a way to use SymPy to solve this problem?
body: <p>I am new to python and using the sympy package. However there is an equation with summation that has to be differentiated, and values substituted into it. I was wondering if there are any examples that I can use?</p>
  <p>The equation I want to differentiate is the pearson correlation coefficient.</p>
  <p>Any inputs will be appreciated.</p>