Summary

We calculated the correlation of the stock returns of two stocks with the corrcoef function. As a bonus, a demonstration of the diagonal and trace functions was given, which can give us the diagonal and trace of a matrix.

We fit data to a polynomial with the polyfit function. We learned about the polyval function that computes the values of a polynomial, the roots function that returns the roots of the polynomial, and the polyder function that gives back the derivative of a polynomial.

Hopefully, we increased our productivity so that we can continue in the next chapter with matrices and universal functions (ufuncs).