NumPy : Beginner's Guide - Third Edition

Time for action – plotting a polynomial and its derivatives

Let's plot a polynomial and its first and second derivative. We will make three subplots for the sake of clarity:

1. Create a polynomial and its derivatives using the following code:

   func = np.poly1d(np.array([1, 2, 3, 4]).astype(float))
   x = np.linspace(-10, 10, 30)
   y = func(x)
   func1 = func.deriv(m=1)
   y1 = func1(x)
   func2 = func.deriv(m=2)
   y2 = func2(x)

2. Create the first subplot of the polynomial with the subplot() function. The first parameter of this function is the number of rows, the second parameter is the number of columns, and the third parameter is an index number starting with 1. Alternatively, combine the three parameters into a single number, such as 311. The subplots will be organized ...