Let's plot a polynomial and its first-order derivative using the deriv() function with m as 1. We already did the first part in the previous Time for action section. We want two different line styles to discern what is what.
Create and differentiate the polynomial:
func = np.poly1d(np.array([1, 2, 3, 4]).astype(float)) func1 = func.deriv(m=1) x = np.linspace(-10, 10, 30) y = func(x) y1 = func1(x)
Plot the polynomial and its derivative in two styles: red circles and green dashes. You cannot see the colors in a print copy of this book, so you will have to try the code out for yourself:
plt.plot(x, y, 'ro', x, y1, 'g--') plt.xlabel('x') plt.ylabel('y') plt.show()The graph with polynomial coefficients
1,2,3, and4is as follows: