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Make filled polygons between two curves in Python using Matplotlib
  • Last Updated : 27 Apr, 2020

Matplotlib is an amazing visualization library in Python for 2D plots of arrays. Matplotlib is a multi-platform data visualization library built on NumPy arrays and designed to work with the broader SciPy stack.

To create filled polygons between two curves a PolyCollection filling needs to be created between y1 and y2.

Parameters for the above task:

  1. x: It is an array of length N that holds data of x.
  2. y1: It is an array or a scalar of length N that holds data of y.
  3. y2:It is an array or a scalar of length N that holds data of y.

Example:

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import matplotlib.pyplot as plt
import numpy as np
# set the width 
width = 3.5
  
# set the height
height = 2.5
  
# set the depth
depth = 65
  
# plot the figure
plt.figure(figsize =(width, height), dpi = depth)
  
# set the x array of length 3
x = [1, 3, 6]
  
# set y1 array of length 3
y1 = [2, 3.5, 4]
  
# set y2 array of length 3
y2 = [3, 4, 5.5]
  
# fill the horizontal arean between y1 and y2
plt.fill_between(x, y1, y2)
  
# show the plotted figure
plt.show()

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Output:
filled polygons between two curves in Python

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