Matplotlib.pyplot.quiver() in Python

Matplotlib is a library of Python bindings which provides the user with a MATLAB-like plotting framework. Matplotlib can be used in Python scripts, the Python and IPython shell, web application servers, and various graphical user interface toolkits like Tkinter, awxPython, etc.

Matplotlib.pyplot.quiver()

matplotlib.pyplot.quiver method is used to plot a 2D field of arrows.

Syntax: matplotlib.pyplot.quiver(x_coordinate, y_coordinate, x_direction, y_direction)

Parameters:
x_coordinate : x-coordinate of the arrow location
y_coordinate : y-coordinate of the arrow location
x_direction : x-component of the direction of the arrow
y_direction : y-component of the direction of the arrow

Optional Parameters:
scale: used to set the scale of the graph
scale_units: used to set the units of the plane with respect to x and y
angle: used to determine the angle of the arrow vectors plotted

Return Value : Returns a 2D graph with arrows plotted

Example #1

#Python program to explain
# matplotlib.pyplot.quiver method


import matplotlib.pyplot as plt
import numpy as np

#defining necessary arrays
x = np.linspace(0,2,8)
y = np.linspace(2,0,8)
x_dir = y_dir = np.zeros((8,8))
y_dir[5,5] = 0.2

#plotting the 2D graph
plt.quiver(x, y, x_dir, y_dir, scale=1)

Output:

Example #2
Plotting multiple arrows on a graph using quiver method

# Python program to explain
# matplotlib.pyplot.quiver method

# importing necessary libraries
import matplotlib.pyplot as plt

# defining necessary arrays
x_coordinate = [0, 1.5]
y_coordinate = [0.5, 1.5]
x_direction = [1, -0.5]
y_direction = [1, -1]

# plotting the graph
plt.quiver(x_coordinate, y_coordinate,
           x_direction, y_direction,
           scale_units ='xy', scale = 1.)

Output: