With the use of the fill_between() function in the Matplotlib library in Python, we can easily fill the color between any multiple lines or any two horizontal curves on a 2D plane.
Syntax: matplotlib.pyplot.fill_between(x, y1, y2=0, where=None, step=None, interpolate=False, *, data=None, **kwargs)
Example 1: Color between the curve of the mathematical function f(x)=sin(x)
Python3
import pylab as pltimport numpy as npx = np.arange(0.0, 2, 0.01)y1 = np.sin(2 * np.pi * x)y2 = 0.8 * np.sin(4 * np.pi * x)fig, (ax1, ax2, ax3) = plt.subplots( 3, 1, sharex=True, figsize=(6, 6))ax1.fill_between(x, y1)ax1.set_title('fill between y1 and 0')ax2.fill_between(x, y1, 1)ax2.set_title('fill between y1 and 1')ax3.fill_between(x, y1, y2)ax3.set_title('fill between y1 and y2')ax3.set_xlabel('x')fig.tight_layout() |
Output:
Example 2: Color between the curve of the mathematical function f(x)=cos(x) and f(x)=exp(x) :-
Python3
import pylab as pltimport numpy as npX = np.linspace(0, 3, 200)Y1 = X**2 + 3Y2 = np.sin(X)Y3 = np.cos(X)plt.plot(X, Y1, lw=4)plt.plot(X, Y2, lw=4)plt.plot(X, Y3, lw=4)plt.fill_between(X, Y1, Y2, color='k', alpha=.5)plt.fill_between(X, Y1, Y3, color='y', alpha=.5)plt.show() |
Output:
Example 3: Color the Rhombus :-
Python3
import matplotlib.pyplot as pltx = [1, 2, 1, 0]y = [2, 1, 0, 1]plt.fill(x, y)plt.show() |
Output:
